Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f517d934c3e0f9a…

MALICIOUS

PDF

86.8 KB Created: 2021-03-23 06:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b516b3661ec73059f5b5c65be6c70ab8 SHA-1: 24dbf8526598f418289ce4e45cafec99599d7788 SHA-256: 7f517d934c3e0f9ac96c72a28d8e21d3e9243f0cd31581467af0afff58295ffc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Prentice hall chemistry worksheet answers'. The presence of multiple external URLs, including those flagged as part of a link farm, points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=prentice+hall+chemistry+worksheet+answers
    • http://jabewes.medianewsonline.com/10668019695.pdf
    • http://jifarobajis.sportsontheweb.net/cambridge_pet_direct.pdf
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/4230620.pdf
    • https://mifanalukuzesu.weebly.com/uploads/1/3/4/6/134688284/9237171.pdf
    • https://cdn.sqhk.co/fiporalisu/hbHgggc/road_traffic_signs_meaning.pdf
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/5e3b8b.pdf
    • https://cdn.sqhk.co/temududote/khJiikG/soccer_kick_game_free.pdf
    • https://cdn-cms.f-static.net/uploads/4481397/normal_6014ce578da79.pdf
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/7957301.pdf
    • https://jutarufuro.weebly.com/uploads/1/3/0/7/130775772/bb42934.pdf
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5fffa4c124b56.pdf
    • https://cdn-cms.f-static.net/uploads/4465269/normal_6035b5745f3ce.pdf
    • https://cdn.sqhk.co/vuveleni/AjijdqP/bevipogufubilus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voxipanovigepiv/hr_annual_training_plan_template_excel.pdf
    • https://s3.amazonaws.com/limepusotanal/what_are_the_unique_characteristics_of_servant_leadership.pdf
    • https://s3.amazonaws.com/wutogugej/how_to_cite_an_article_with_no_author.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/software_testing_interview_questions_and_answers_for_freshers.pdf
    • https://s3.amazonaws.com/kawotexulozax/collage_maker_free_for_laptop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011903.bin
3f6f37c5593558ecc848803b67d39aa43c0382e428cb33b19b62fcedbc5c563b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 5300 bytes
font_01_sfnt_off00012af3.bin
3c682cd7e1189fe04ed62aaf617277b068b988febe82ecc9b01f94aceb7281f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 10352 bytes

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