Malicious PDF — malware analysis report

Static analysis result for SHA-256 9334e1e53724e099…

MALICIOUS

PDF

99.5 KB Created: 2021-03-24 03:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ddfff5f159d6134ac326e0ef7a200809 SHA-1: 3953d0739cc3e7b644e45385746602e7722b3f27 SHA-256: 9334e1e53724e0997988787a549496fe8d74b04b0d3cbbc98158ae4f46b1e52f
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 0.9995

Heuristics 5

  • 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 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://lozipotod.ru/wix?keyword=calculus+solution+manual+by+howard+anton PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6048ea5462c26.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/hhgh6hb/cholesteryl_ester_formation.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/G4ifidu/46863832901.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/Zjdhaid/zixuvupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367305/normal_5ff4792b61d45.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/K1igigi/bang_bang_song_meaning_nancy.pdfIn PDF document text
    • http://sipebep.22web.org/emulator_for_android_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_6046cbe5bf5a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496571/normal_5fe91729b8289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_600d2dfa7baf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5fdee480e975a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_6028ef332c1ac.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/lK9hdic/super_mario_maker_2_outfits_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/sine_and_cosine_rule_worksheet_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/statin_guidelines_2018.pdfIn PDF document text
    • http://vumupekosevi.rf.gd/siguzavu.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/consolidate_data_from_multiple_worksheets_vba.pdfIn PDF document text
    • http://garamasonodolu.epizy.com/catalan_independence_bid.pdfIn PDF document text
    • http://sujosivetobifir.epizy.com/22579956844.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 5420 bytes
SHA-256: 5eb03e6b7ff35e8b67c1a1c5b76514f0a414287ce131f75d109aea550c6f7563
font_01_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 2184 bytes
SHA-256: c5b453d0cacedb53505e813196b1fab130c37ae889da1b6a9575f18baaa9ff86
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 13580 bytes
SHA-256: 2761e84956495c4c8f8e6af4ec5fcc3960f53bb2bcb07a69d73e30a782fda53b
font_03_sfnt_off00016ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACE 16140 bytes
SHA-256: 6bd38090ed777df9b92677ea85131394f31f8e693e2fa156965331ed3544f37d

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