Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa1374188a45df8…

MALICIOUS

PDF

86.9 KB Created: 2021-05-17 21:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3f3558faf26e99fb49b2218ee062693a SHA-1: 2436763d6eb6f98f8a00d5502ac24a7f94fb1e89 SHA-256: 7aa1374188a45df8f2b33a71095a67eda61fb04ddb6acfc748d406cb6e29a6d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which are hosted on dynamic DNS services and appear to be part of a link farm. The primary URL, https://kuzutuzo.ru/strik, is presented in a way that mimics a search result, suggesting a phishing or content-scraping lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=what+type+of+lawyer+is+highest+paid+in+south+africa PDF link annotation
    • https://sebigazawipad.weebly.com/uploads/1/3/0/8/130814057/sipuworikabada.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/pusudafizojafo.pdfIn PDF document text
    • http://wamepiguvoj.iblogger.org/xopadukotiromojufofav.pdfIn PDF document text
    • https://xokefazekuli.weebly.com/uploads/1/3/5/9/135992394/fotexes.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/817ae5c36.pdfIn PDF document text
    • http://mivofalo.22web.org/beautiful_life_assamese_movie.pdfIn PDF document text
    • https://fejisamuzek.weebly.com/uploads/1/3/4/6/134636520/830b0960d00a97b.pdfIn PDF document text
    • https://wubeponasi.weebly.com/uploads/1/3/1/6/131606197/butasos-zepuzadeligegat.pdfIn PDF document text
    • http://sikepelisu.22web.org/quotes_life_goes_on_bts.pdfIn PDF document text
    • https://pidakobanaxob.weebly.com/uploads/1/3/4/4/134463411/3186644.pdfIn PDF document text
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/mikas.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/460719b117015d.pdfIn PDF document text
    • https://mawafusujomadil.weebly.com/uploads/1/3/5/3/135351104/7506182.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekovukubetib.epizy.com/27180111766.pdfIn PDF document text
    • http://todewil.epizy.com/how_much_does_a_usps_supervisor_make.pdfIn PDF document text
    • http://xevotoxukapo.epizy.com/calidad_y_gestion_ambiental.pdfIn PDF document text
    • http://japotegalavig.epizy.com/dog_man_books_read_to_me.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/duwezeve.pdfIn PDF document text
    • http://zodotisejomiga.epizy.com/is_the_a_sequel_to_twilight_series_books.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/yale_university_endowment_fund_annual_report.pdfIn PDF document text
    • http://furugavasipif.epizy.com/4891125062.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/julius_caesar_act_1_scene_2_character_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/the_scarlet_pimpernel_tv_series_1955.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/repizixepali.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/whirlpool_dishwasher_quiet_partner_ii_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/how_to_read_ecg_results_apple_watch.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_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 5624 bytes
SHA-256: c273ea63a3d749f3c631a6a53eb988271e132860a0e1e21c480266750049a1ca
font_01_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 11124 bytes
SHA-256: 8fba7c8adb9634f20b9c9e97b17f759bd9b1fcf09d8da8d93a5b57bfda07a2a3

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