Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13c5d72f4e4e10a…

MALICIOUS

PDF

83.6 KB Created: 2021-06-04 02:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6138b7de1ccbd0a1a8b3b015729c7b76 SHA-1: 87d7c4967e1b48dede981cabd4a58ce57423a3c0 SHA-256: a13c5d72f4e4e10a30ba7c5a86599c33871c6fe41e95a0c4e11b0c5b83a94f36
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 0.9998

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://catamma.ru/pbw?utm_term=enrique+iglesias+mp3+songs+free+download+320kbps PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416149/normal_5ffc4ed259ca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_6030271fabb79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_601b2ff9e26cd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383917/normal_60b25742a64ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465389/normal_60227572a7f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529095/normal_606392fe620e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444866/normal_60060ec61d93d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6929012-0d58-4c40-a9bc-ec3a0290912c/swann_security_camera_power_adapter.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/the_secret_life_of_walter_mitty_streaming_vost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4f25cd-f58e-4606-a637-f95316dfdfe7/easy_healthy_lunch_ideas_for_fussy_eaters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3477b8f5-8a55-48b6-9cf4-d1f90ee508d1/best_comfort_bicycle_for_seniors.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144469422/fuvarowajujegirejoxiziv.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/w/file/fetch/144564498/how_did_alliances_lead_to_the_start_of_world_war_i.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/f/how_to_pass_your_drivers_license_test_in_south_africa.pdfIn PDF document text
    • http://ludagobef.pbworks.com/w/file/fetch/144543414/96251985887.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/63543909034.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/lulufob.pdfIn PDF document text
    • http://felefejimax.pbworks.com/f/sekodosuxivuzitizojadisop.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/what_movie_was_wonder_woman_in.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_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 6180 bytes
SHA-256: d6c2c546f2e0a20d57819b7d60d3a4e85d1ce0bd90beb6527dc0abe598caa3a2
font_01_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 11372 bytes
SHA-256: bccfb0eb0638c82fabc023460f75474ed37bb0de40283e225462e97989cfb8bd

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