Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79a9fff8ccf1a11…

MALICIOUS

PDF

81.0 KB Created: 2021-03-12 00:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8622f6a14046723716f2621eb6997576 SHA-1: 4ca358f0aceca37738f9752fa6353da8446a5324 SHA-256: a79a9fff8ccf1a118e59f5d81e0055106e931bd015e4d5fb76e7d069f8a89dd8
246 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics, including a critical finding for brand-impersonation credential phishing. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. One prominent URL, https://dejegudiferu.weebly.com/uploads/1/3/1/8/131857494/lipivizokov_vufitu_foxuladetuvajik.pdf, is explicitly flagged as an action link for a WhatsApp credential phishing lure. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dejegudiferu.weebly.com/uploads/1/3/1/8/131857494/lipivizokov_vufitu_foxuladetuvajik.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://xezojetit.ru/award?keyword=all+quiet+on+the+western+front+chapter+7+pdf PDF link annotation
    • https://dejegudiferu.weebly.com/uploads/1/3/1/8/131857494/lipivizokov_vufitu_foxuladetuvajik.pdfIn PDF document text
    • https://cdn.sqhk.co/supibufuk/TnFiejb/situational_interview_questions_and_answers_for_retail.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/sidawejog-gepofigimeno-bajegal-kametuzis.pdfIn PDF document text
    • https://vipoferizapil.weebly.com/uploads/1/3/5/3/135346342/9033852.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/47800188370.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/i_too_sing_america_julia_alvarez_theme.pdfIn PDF document text
    • https://cdn.sqhk.co/pobisobat/IuigH3P/49602002710.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/ways_to_feel_better_after_overeating.pdfIn PDF document text
    • http://bexukavinawexov.mygamesonline.org/3565788182.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/eaFidLP/913647115.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/15797386564.pdfIn PDF document text
    • http://kigaruzolalo.mypressonline.com/the_lion_the_witch_and_the_wardrobe_summary_chapter_1_and_2.pdfIn PDF document text
    • https://nirixebuwema.weebly.com/uploads/1/3/5/9/135990662/gefotituwed.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/GQje1id/any_cure_for_inclusion_body_myositis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://torejejowomu.myartsonline.com/john_deere_js30_carburetor_removal.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_73610ed8be4e4a19ac766deb2d3c8b46.pdf?index=trueIn PDF document text
    • http://paguxesij.myartsonline.com/weather_and_climate_activities_for_3rd_grade.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_65dd90a6a1d04e26b3b7febf028edb19.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_f7721c214f7c4a1db38a4a0ef3c47fc5.pdf?index=trueIn 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_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 5532 bytes
SHA-256: 8077713e660c809edecc06a8fef44aadf23bc2eae59effa5b673621a09a6fd71
font_01_sfnt_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 9804 bytes
SHA-256: bbd63e304822f271c4c33d57ed639c1d4760ecc717d930cb074733c6ea1da7ee

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