Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f69cdbcbe1c758…

MALICIOUS

PDF

70.7 KB Created: 2021-05-26 20:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 68820e8fa05638f35e55f002e6651494 SHA-1: 23e3396bf72ac8f59aefeaf338165e73090e5ce0 SHA-256: 91f69cdbcbe1c758181a10ed719299461fd17b6b9d43d245d64f00cb42611092
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file impersonates Norton to lure users into clicking a link that leads to a link farm, likely for credential phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs and the PDF structure, which contains a large number of external links, support the phishing and link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xenafakawipa.weebly.com/uploads/1/3/4/8/134879239/zelupup.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=one+flew+over+the+cuckoo%2527s+nest+part+3+questions+and+answers PDF link annotation
    • https://xenafakawipa.weebly.com/uploads/1/3/4/8/134879239/zelupup.pdfIn PDF document text
    • https://waniritapi.weebly.com/uploads/1/3/0/7/130739375/vubamiriwilaw.pdfIn PDF document text
    • https://rixukofet.weebly.com/uploads/1/3/4/1/134108779/3042132.pdfIn PDF document text
    • https://koximewi.weebly.com/uploads/1/3/0/7/130775363/giziwojuligonorekil.pdfIn PDF document text
    • https://wufezaju.weebly.com/uploads/1/3/0/7/130738917/sojebixunok_gedulupokixemer_butovitusaj.pdfIn PDF document text
    • https://wukaxasupureje.weebly.com/uploads/1/3/4/4/134440875/duduxekenup-kanozazisikusit-buragigasu-xagifodema.pdfIn PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/xosafavulav.pdfIn PDF document text
    • https://disemiseses.weebly.com/uploads/1/3/1/4/131407045/dodewobuluw.pdfIn PDF document text
    • https://powagaminabori.weebly.com/uploads/1/3/0/9/130969211/tusojawako.pdfIn PDF document text
    • https://jebezowurexa.weebly.com/uploads/1/3/4/5/134576847/1124962.pdfIn PDF document text
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/wigexativuzedon.pdfIn PDF document text
    • https://danuxuzajuzawo.weebly.com/uploads/1/3/4/7/134768569/kepununemagopoja.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/monufawexebokofu.pdfIn PDF document text
    • https://jewevugaxezi.weebly.com/uploads/1/3/5/9/135967143/7701858.pdfIn PDF document text
    • https://nomomiwadij.weebly.com/uploads/1/3/3/9/133997716/vusoxip_nikow_majubit_pinufeve.pdfIn PDF document text
    • https://toguxiwo.weebly.com/uploads/1/3/4/6/134645105/jizupuk.pdfIn PDF document text
    • https://tagarimoruta.weebly.com/uploads/1/3/4/3/134320697/wuzalebapidazo-wopofin-midev.pdfIn PDF document text
    • https://mifadumuvuvog.weebly.com/uploads/1/3/4/6/134689338/gokatakesusab_motipej_padaduzojori.pdfIn PDF document text
    • https://bazamafew.weebly.com/uploads/1/3/4/0/134016738/4518928.pdfIn PDF document text
    • https://nizitorewazoxi.weebly.com/uploads/1/3/4/7/134704220/76ef75bac5e8.pdfIn PDF document text
    • https://tavigawatogup.weebly.com/uploads/1/3/5/3/135389884/7020815.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/53e3f6c.pdfIn PDF document text
    • https://nugijokokul.weebly.com/uploads/1/3/0/9/130969158/566850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76288ae-d960-4ffb-ae66-4cc430d375cb/what_is_a_pun_in_romeo_and_juliet_act_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa473a77-05e1-4c3b-8f75-fddf7462ca44/how_to_program_lg_remote_to_bose_soundbar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10e3548-b3ed-4539-a874-7531eb5c6bfa/baaghi_3_movie_download_filmyhit_hd_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02056f03-9392-400a-86a7-c4b83cede428/42553950289.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 5808 bytes
SHA-256: 7d698916feb301394e385d1227677f04b8a69feaac412e323d1ec42868b4d675
font_01_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 10240 bytes
SHA-256: d7f0f6cb7864c52bc134c4d5c1273c00c470cfb4cc618c5138732ab346c23905

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