Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51d7b5e895c0363…

MALICIOUS

PDF

80.4 KB Created: 2021-03-05 15:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b96faffe2d76eb338544832b0a67d95e SHA-1: 12e7fbfb7d4985f157e842f789853546b73ffc98 SHA-256: a51d7b5e895c03630d2da83821987d247b450bb084a6703e5f01aea487c61a4e
186 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 0.9998

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://bologen.ru/aws?utm_term=english+short+story+book+pdf+download PDF link annotation
    • https://cdn.sqhk.co/gisatajofo/AhixQja/fall_guys_ultimate_knockout_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/weteroliwo/eijhUib/robot_crash_fight.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/67653982947.pdfIn PDF document text
    • http://negitib.iblogger.org/zosag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_cc551aaeee95438fb29e6ab85bf1b843.pdf?index=trueIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_bc3d0ca38fba4dd09b6b71c1e3851c11.pdf?index=trueIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_2039f16fac1f4740b8157089cab7795b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c629428-6c55-4dde-9065-0e49127f1f1f/88634168879.pdfIn PDF document text
    • http://zepuwiz.atwebpages.com/zenizajikoxuniz.pdfIn PDF document text
    • http://juvadapirepaf.epizy.com/rukowetilitunubalipi.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_4db6de92f3b04dfb94e5c5f778e9a4f9.pdf?index=trueIn PDF document text
    • http://nujabaforebi.epizy.com/7151330687.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_0e204bf756f84d4ca9433611b0417df7.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_002d314f59c34adaa9c1bbbcb4577e66.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_cec822b160b4421ca134481146c0f711.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e16f09-77c0-4ef3-a4f3-52576f7ad635/giwevoxizefuwisiguvofet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 5328 bytes
SHA-256: 9faf088baaa3ef418e070815b69bf5101dfcc5216b97cd47052e8097ece83e64
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 11076 bytes
SHA-256: ce343447c81e8b6d0ba7e5c61a5cf949292838d00e6eee7afa1cfcca6e3d9b45
font_02_sfnt_off0001262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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