Malicious PDF — malware analysis report

Static analysis result for SHA-256 851075a5f7adceef…

MALICIOUS

PDF

87.0 KB Created: 2021-03-17 06:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 786ba9c97750fd90b9fc6e45a7c0015e SHA-1: 9113095e26f783830e11b182759874ab3da5e296 SHA-256: 851075a5f7adceef1ed8599276ad7756d6c8e13a3f09d22d4aba0e593469cba2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=convert+octet+stream+to+pdf+java PDF link annotation
    • http://golulim.iblogger.org/reply_to_cheque_bounce_notice_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_603a5ee7bdabf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_6028bff09af79.pdfIn PDF document text
    • http://smm-target.ru/32551764699vqzfb.pdfIn PDF document text
    • http://jsexj.fun/parabolas_de_jesus_para_nios_videosafcqp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_603c669572744.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/A62IieX/zapifojus.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/gigebilaj.pdfIn PDF document text
    • http://snapchat-alert.com/diwesigamofokazevunijonw080v.pdfIn PDF document text
    • http://sberbank.link/jawexikelometubowexekukan7ghe0.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/jjaigjb/lightroom_presets_app_review.pdfIn PDF document text
    • https://labupapem.weebly.com/uploads/1/3/1/4/131406977/9934254.pdfIn PDF document text
    • http://show-visitor.xyz/37083196232348q8.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/dirulaguwozon.pdfIn PDF document text
    • http://disconto50.info/sebexarozeraxoriruvuviguth76ep.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/XhbVVaT/mikifigamaviladopakajis.pdfIn PDF document text
    • http://masalev.ru/how_to_set_up_jam_zero_chill_speakerde4po.pdfIn PDF document text
    • http://dostafood.xyz/67215027755h8pj0.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/bulatobiduzuwatesu.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/dHigrcx/84632880800.pdfIn PDF document text
    • http://slimerecipe.org/what_is_express_terms_in_contract_law4ywhc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xuwuxubemepimox.rf.gd/tivagufejeso.pdfIn PDF document text
    • http://zavinawotomuvef.epizy.com/autodesk_maya_tutorials_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 5168 bytes
SHA-256: dcc45968dee224d23f5f287f820a6f6ffba961b15200774176947fb00c3896bf
font_01_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 12220 bytes
SHA-256: dc47bc24b795812af0a5e8ca7b5b94e8eff277b7044606d040ae6c9ef2da290c
font_02_sfnt_off00014062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14062 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.