Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2acf8d7ea5a52b…

MALICIOUS

PDF

97.9 KB Created: 2021-02-11 22:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 10f44e2c493de12e50c9c0c827990294 SHA-1: 290abbc5d51c033fbf80d39d2774b63aa013e1ba SHA-256: ac2acf8d7ea5a52b5f5f8b424f142749686fca03c4a28dd4c9423e6f441f4c8c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/wix?keyword=russia+hetalia+age PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493876/normal_600a888f9aad5.pdfIn PDF document text
    • http://freshmind.net/image_quiz_questions_and_answers3h8h0.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/b5KhgGp/35029030539.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/meromize-berugumofinav-figodasutaw-lotemewigexatav.pdfIn PDF document text
    • http://jowakemanek.iblogger.org/vuzizabimufusud.pdfIn PDF document text
    • https://debotokatetore.weebly.com/uploads/1/3/5/3/135345182/gewofajowos.pdfIn PDF document text
    • http://stankoff.org/vbspu_examination_form_datem83o0.pdfIn PDF document text
    • https://voresefum.weebly.com/uploads/1/3/0/8/130813922/genivubafinepuxolij.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/e6fgieT/84407226555.pdfIn PDF document text
    • http://starconflict-game.ru/500_poses_for_photographing_couplesoemw6.pdfIn PDF document text
    • http://50offshop.pro/spectrobes_beyond_the_portals_cardsx72ud.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/ihGTgcg/walmart_cake_decorator_training.pdfIn PDF document text
    • https://pizavanaxuvilu.weebly.com/uploads/1/3/5/3/135386491/mazeb_fetagu.pdfIn PDF document text
    • http://rakuropa.iblogger.org/d_h_u_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/gfrcFhd/font_squirrel_dancing_script.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupepepasis.rf.gd/common_core_algebra_1_emathinstruction_answer_key.pdfIn PDF document text
    • http://tiwogiponifi.rf.gd/ibm_java_6_aix.pdfIn PDF document text
    • http://bosapaw.rf.gd/loch_awe_fishing_reports_2019.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 11300 bytes
SHA-256: 7b6e2764fc4f0f352e9b0faa1a573e5bf9b524f1adc186eb256133aa076ec6f1
font_01_sfnt_off000126ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 4856 bytes
SHA-256: c131574da411120ab69138eb0b812c44b37930f650e62b689c29f4b4568d06e3
font_02_sfnt_off0001377a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377A 13684 bytes
SHA-256: 72e449c31f389ed24807c2eb797d03f6d8206b2f30e10fd36bbc4b98f2b870f5
font_03_sfnt_off000162c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C5 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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