Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a31a310a8aeb76f…

MALICIOUS

PDF

82.2 KB Created: 2021-03-19 21:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b5658f6ad92488e3f436a39986d15474 SHA-1: 539e5d422bdccb44f974b888a9c3fe4f320a0baa SHA-256: 4a31a310a8aeb76f7fecb4b45254c6719c389b37b453d6d398e24719a68fd5c6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/wix?keyword=gobble+gobble+turkey+song+thanksgiving+song PDF link annotation
    • http://pejofewetoz.22web.org/how_to_verify_lean_six_sigma_certification.pdfIn PDF document text
    • https://cdn.sqhk.co/kavatupopum/b7fHKig/backflip_madness_free_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/VbDgcib/hide_app_hide_icon_apk.pdfIn PDF document text
    • https://wokogosomexar.weebly.com/uploads/1/3/5/3/135322546/d0f1ffc.pdfIn PDF document text
    • http://kororepunugited.iblogger.org/saxilidufimotagefar.pdfIn PDF document text
    • https://cdn.sqhk.co/wejuladuke/fhehfjh/67493249276.pdfIn PDF document text
    • https://nebijuwako.weebly.com/uploads/1/3/4/3/134376342/af24461f4173a8c.pdfIn PDF document text
    • https://weligolujevis.weebly.com/uploads/1/3/4/7/134748453/a62c3.pdfIn PDF document text
    • https://gujukajiw.weebly.com/uploads/1/3/1/4/131437807/d887092afd29.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/vubufinaxawe_resasag_kevesajogivoma.pdfIn PDF document text
    • https://cdn.sqhk.co/fexivijemozu/gJhbPhb/tufedasunirapapaf.pdfIn PDF document text
    • http://kismykeitio.best/dog_man_books_readablemf0ce.pdfIn PDF document text
    • http://milanomoda-italy.website/harry_potter_8_movie_caste866h.pdfIn PDF document text
    • http://wafolepis.iblogger.org/geziwasifokizadax.pdfIn PDF document text
    • http://twoup-viktoria.online/information_security_specialist_salary_canada5tgp4.pdfIn PDF document text
    • http://semazolowogafoj.22web.org/46272537448.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/0KFidhe/my_little_princess_castle_apk_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/giiggji/best_free_movies_app_apk.pdfIn PDF document text
    • http://bossyonlinex.com/stock_exchange_open_on_veterans_dayprmub.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
    • https://s3.amazonaws.com/bikikanafopavu/53875482535.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/62566429454.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/bootstrap_checkout_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/bazafuxaberutoridog.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/80361471393.pdfIn PDF document text
    • http://rowabereduxafu.epizy.com/48019297849.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_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 5224 bytes
SHA-256: fbe91fb3f9ab4dad7529bc5b15327dea683ff4f0ed247d8f7320e93c4123c398
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 10852 bytes
SHA-256: bac6b77e26ffe513bc8abf8af664a76654a15cdaec8fd869cec5e986bb7b120f
font_02_sfnt_off00012c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f