Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0abc16b15f0734…

MALICIOUS

PDF

86.3 KB Created: 2021-04-29 22:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ddd4b67a490c41e3965f08684cbaa691 SHA-1: 0fa0e498d6c998754ff53ffd2998e27c2feb6070 SHA-256: 8e0abc16b15f0734e49c32b7f42a20be454b41c60db4f7f8757c5b556d921952
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs and is flagged by heuristics as a link farm and potentially malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, contains text related to chemistry problems, which is likely a lure to direct users to malicious websites. The presence of numerous external URIs suggests an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=how+to+solve+half+life+problems+chemistry PDF link annotation
    • http://avit0.pro/dance_dj_songs_videolwmf9.pdfIn PDF document text
    • http://art-practice.org/radalugepedofomamisamonue0o5e.pdfIn PDF document text
    • http://tunizunifegitof.66ghz.com/66203381772.pdfIn PDF document text
    • http://cetapp.xyz/richmond_50_gallon_water_heater_reviewsxfejg.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/red_dead_redemption_2_achievement_guide_and_roadmap43gde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_600522ba38357.pdfIn PDF document text
    • http://dressnbuy.com/lufawilawaxut7ni8i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457281/normal_6065217f931b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3228dc58-b2c1-4aed-ac20-03fc52793822.filesusr.com/ugd/43afbb_50ea56d0c29244c6b61628fa6c84d170.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e06cd4-89e7-4bea-a4ed-2754638a5f7d/midavikagonag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db32e564-62fe-457a-998f-8019dfca5dd2/75923125957.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_7721896ae29640638eca96eb12ee40fa.pdf?index=trueIn PDF document text
    • http://batuzotunar.rf.gd/crappie_fishing_guide_central_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b9bafb-0835-4132-a903-02a66b3580b5/maluxapizavosolekimimogel.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_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 5608 bytes
SHA-256: 618157951778616e262e02d8ec931b23435e86c7a03af3577cabcfcf38271cd5
font_01_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 11004 bytes
SHA-256: 1cbdae20d40154dcab30a66d89c8c51862f9973eb47698eb2596caaed710032d

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