Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7a8b2389a9d06e…

MALICIOUS

PDF

81.7 KB Created: 2021-03-11 20:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01a6eb8210825c863fee4a867a3708cb SHA-1: 2b1414f37c8327c6474def5f336afa1196d87eb0 SHA-256: 4e7a8b2389a9d06e86737d7522e44d81a53f684f44c9df8a65fed5c373c12d9e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting an SEO spam or link farm operation. The embedded URLs likely redirect users to malicious sites, potentially for phishing or malware distribution.

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://ponafet.ru/123?utm_term=australian+curriculum+assessment+and+reporting+guidelines PDF link annotation
    • http://kopogaxepaku.sportsontheweb.net/88281911828.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/cifZhc0/46668992265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_6042e6dca9d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_600f76ba330a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_6037cf2bd2588.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/gfibifz/bucket_list_family_youtube_income.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/java_swing_mysql_connection_example.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/pazatuv/in_custody_report_modesto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f4d1a4-a717-4c5b-95d2-3a9e58bc7809/how_to_keep_a_pelonis_heater_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb91d391-09f6-4ea7-b3d8-f20a2555ae8f/94521140272.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/mapsource_6._16_3.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/preposition_practice_5th_grade.pdfIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_4146a1f5f2b74e3184be5fea9e63765d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/754420fe-e53a-4250-af24-57e84c4a238d/summary_of_merchant_of_venice_act_1_and_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/770de3ad-9608-4a20-8cbe-15ce8c9b3785/easy_sight_singing_exercises.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_5d4314ed71ae4b54992e1f4ee23fb6b6.pdf?index=trueIn PDF document text
    • http://jelomasulavi.atwebpages.com/batavuk.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 5380 bytes
SHA-256: 297b208f37e2f987e801dc903b022590ae915d5649111e44a7fb2d8ccdab125c
font_01_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 10620 bytes
SHA-256: 80d20428957c53ab6a8452ba0556bb6079d663d2079c2fdc5da0e34f3a88f138

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