Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6003f492363d4c4…

MALICIOUS

PDF

75.8 KB Created: 2021-04-20 00:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1d815b2484e0413ba113b5ce54874ad SHA-1: 5ebc68e4426405c7a2a373e070111d81dd58319f SHA-256: a6003f492363d4c446d0343ffc07a114fe86e5eeb07d3f94b149a2fce43c2c65
156 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 0.9997

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 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.
  • 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://seumenha.ru/strik?utm_term=how+to+sew+with+brother+cs6000i PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418985/normal_5fdfcffa186f1.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/eicfi1V/resident_evil_4_merchant.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448724/normal_605fb8ae9962b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413567/normal_5fe5eaf2c1f7f.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/gcggjeg/20499896560.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_e8f1641046db45bba17ffc66acd361c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xokebore/saucony_guide_iso_2_solereview.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/rekobijuzofixemimafifez.pdfIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_f22f4b02e26742efa04918eedfea5e1a.pdf?index=trueIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_caf455df85c84bb0a3ff216626e6e88a.pdf?index=trueIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_fa3a44feffce4bb7a38d135025557367.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/bifokewuza.pdfIn PDF document text
    • http://jikeroti.epizy.com/dr_weil_anti_inflammatory_diet_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/meguzamu.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_f3ef927a7bc04228be80958525e9b748.pdf?index=trueIn PDF document text
    • http://wadokeg.epizy.com/al_quran_terjemahan_indonesia_free.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_75519c20ca3a443e8df6a9c58fed7bc5.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_755dc25d8b4a442ea2ef2bce9515aec9.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_4071b70ccf3c47e1bda07c9786028735.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/jedewafexozigazosanu.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_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 5136 bytes
SHA-256: 4ec8fd72a2c7fa32f733158362d74e3c19ebc22b199482c6d5c2706b22d52ce0
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 10384 bytes
SHA-256: 2567169861b4855570a0e811c544bba34419d1f0102133c94259609c9dd0b140

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