Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d22786a8dbb52b6…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 16:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fe2dc39085c4cad58a7166efae2858f SHA-1: 573d7d26b774cfc85d1c9a92be549830accec6bc SHA-256: 2d22786a8dbb52b68b9bb9d47bf61bf23a9af6efacebf0d4752cb543761fe056
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme. One of the primary URLs extracted is https://mezovovuduw.ru/wix?keyword=brookstone+egg+clock+manual, which likely serves as a lure to a malicious site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=brookstone+egg+clock+manual
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/2364831.pdf
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/debagetudipejus_vafis_selonevov.pdf
    • https://static.s123-cdn-static.com/uploads/4466165/normal_5feeba12056eb.pdf
    • https://cdn-cms.f-static.net/uploads/4459780/normal_5fd235be02fe7.pdf
    • https://static.s123-cdn-static.com/uploads/4421940/normal_6001d4a96eab2.pdf
    • https://tozuriko.weebly.com/uploads/1/3/1/4/131437247/koneloreparudi-desuwu-jixufu-pifotomuzu.pdf
    • https://nokatumevizo.weebly.com/uploads/1/3/2/7/132740479/203332.pdf
    • https://static.s123-cdn-static.com/uploads/4406787/normal_5ffff9bd3baec.pdf
    • https://lixebofupasiwik.weebly.com/uploads/1/3/2/3/132303312/3960538.pdf
    • https://vasuwogi.weebly.com/uploads/1/3/4/0/134017955/fukuruluj.pdf
    • https://cdn-cms.f-static.net/uploads/4414169/normal_6049263db76bd.pdf
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/2876573.pdf
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/efedd6f600.pdf
    • https://static.s123-cdn-static.com/uploads/4473053/normal_5febcca7eb850.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/temujonuwu/fodunivejovewa.pdf
    • https://uploads.strikinglycdn.com/files/a98bbf22-cd80-4062-8019-9ec2a85c3a16/reading_programs_for_struggling_readers_free.pdf
    • https://s3.amazonaws.com/temujonuwu/lightning_mcqueen_games_free_for_pc.pdf
    • https://s3.amazonaws.com/warapagefasovi/guided_meditation_for_falling_back_to_sleep.pdf
    • https://uploads.strikinglycdn.com/files/438f375e-0e01-40cc-93b1-baea66e04690/the_taming_of_the_shrew_movie_2005_online_free.pdf
    • https://uploads.strikinglycdn.com/files/cc98cb8c-0822-435b-a92c-90c34f2067ad/67021543796.pdf
    • https://uploads.strikinglycdn.com/files/d054ec7f-6eb1-447a-bb70-6324b383f2d6/apa_ethics_code_forensic_psychologists.pdf
    • https://s3.amazonaws.com/fasudikek/10969426182.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a5.bin
13c3aa9316fc0fc053e2555daff7ab2bbc1b82fb035802e1199f19f12b61efb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 5232 bytes
font_01_sfnt_off00010863.bin
b6a14d01d32c59209ad11edb95331087c8a536942a1fd446000ef285382f653a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 12116 bytes