Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5aad4737b5d5bc4…

MALICIOUS

PDF

101.5 KB Created: 2021-04-07 08:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3cb5a40027e4d4cfe2a3f7462f108f6 SHA-1: 705565df3a06c617d7effffd2bb2a8d29ae1ae1d SHA-256: b5aad4737b5d5bc4ca93adef908a041e74b81ad76ce4f9d11a807c241c38e19e
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://golowaki.ru/123?utm_term=jobs+vocabulary+elementary+pdf PDF link annotation
    • http://vugiris.22web.org/edexcel_igcse_mathematics_b_textbook_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451930/normal_5ff9b2963d5a4.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/0dWQ2gf/1855322500.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/Jijgcu7/48580272721.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/Aichdgf/jepunulibam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408001/normal_5fcf1fd2b0860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_5fd11ad93b69c.pdfIn PDF document text
    • http://wufutawolemipa.22web.org/film_adaptation_theory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_603b9a2046c97.pdfIn PDF document text
    • https://cdn.sqhk.co/kofatuziwu/iiiiagf/xuzoputavax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488806/normal_6033b904e9ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_6054c956af933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_5fd7a7a12960f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_606ce0494927d.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/how_to_apply_adore_semi_permanent_color.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/12335710139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_5fdb81de33549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wudofowukad.rf.gd/can_i_have_a_cup_of_tea_please_in_french.pdfIn PDF document text
    • http://tituroxir.rf.gd/airplane_games_3d.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/71574313361.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/annoyance_crossword_puzzle_answer.pdfIn PDF document text
    • http://xenexunir.epizy.com/boliwuxoz.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15164 5592 bytes
SHA-256: 6c21515cf20153d9877bbffc1ba92bbe5ee8a4c158a7498279798727b3c0ea1b
font_01_sfnt_off0001645b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1645B 10700 bytes
SHA-256: 93109255691440aa680b73ad7f8dc066b6feedef8a5794793fae76e93d9fdda8

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