Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaf9e2f85f44377…

MALICIOUS

PDF

81.9 KB Created: 2021-03-13 12:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0bd136c1b4f9a5745454cd51556097e2 SHA-1: 381d3f113111b754c600626a4cf0f77bbde7f20d SHA-256: aeaf9e2f85f44377a624a718beeccc81dd6cde4bc44f3ed3bec4756afe477785
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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.
  • 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://crophysi.ru/aws?utm_term=numerical+methods+for+engineers+and+scientists+pdf PDF link annotation
    • https://xifopuwo.weebly.com/uploads/1/3/4/8/134852026/931416.pdfIn PDF document text
    • https://cdn.sqhk.co/fomolunuvufa/jh4ig8I/tj_maxx_near_me_open_tomorrow.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/cl4rwjd/classroom_of_the_elite_season_2_2020.pdfIn PDF document text
    • http://bcipreactivaperu.com/9816822947ammp0.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/PjjAigt/warriors_game_tonight_on_tv.pdfIn PDF document text
    • http://damvglaz0.xyz/39753656848lwcc7.pdfIn PDF document text
    • http://dostafood.xyz/937714100744tpza.pdfIn PDF document text
    • https://dozemobogojegum.weebly.com/uploads/1/3/4/7/134759036/3c424c.pdfIn PDF document text
    • http://jexemukanofefoj.iblogger.org/44525005200.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/6040181.pdfIn PDF document text
    • http://gayerkan.com/encyclopedia_brown_book_levelk634o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/307ea470-c6a2-4e83-9387-a8f7976dffe6/kunipiwuxakolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c928f24-89e4-4201-9d72-042f5bb97f21/samsung_50_inch_qled_4k_uhd_smart_tv_qn65q60tafxzc.pdfIn PDF document text
    • http://mavipob.epizy.com/51540384216.pdfIn PDF document text
    • http://tefolinum.epizy.com/jopivolepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602705e7-65dc-4897-adcd-8b1a4cbb5580/dofuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f0296f-8003-43e1-b1ef-64a68de8a97f/unix_command_cheat_sheet_vi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ff2c53-c727-48be-83a7-8ece6a6615ab/66893676750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1e309a-ef88-4863-8574-87ab1f4cb692/pronom_relatif_qui_que_dont_ou.pdfIn PDF document text
    • https://www.linkedin.com/in/sharmistha-chatterjee-7a186310/ComprehensiveIn 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_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 5536 bytes
SHA-256: d8f08ea57766a823b00a88f9c9ee32dafe088951f208cff8a4b798a7368b65eb
font_01_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 10448 bytes
SHA-256: d4186443bd4859da2eb0b33962ee122d9551e667867460ec43065db195b3f86a

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