Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1ff80f3dcd6f8c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-06 14:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a3e72dd73d9224007eb4ab5d986a178 SHA-1: 7e5dc17a0545bda31e65a081dfe307407e7a4cdf SHA-256: 6a1ff80f3dcd6f8c0e403104bef869abee5e1efae7b65c80619df5b03e7f02d2
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to 'childhood trauma' to entice users to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://xezojetit.ru/123?utm_term=how+to+heal+after+childhood+trauma
    • https://lisudite.weebly.com/uploads/1/3/2/6/132682892/kozubopanowuxuxow.pdf
    • http://topcreditcheck.info/moroduvilujif2g9z.pdf
    • https://dodapufil.weebly.com/uploads/1/3/0/8/130813701/dd981.pdf
    • http://8bitbeardsco.com/graphic_novel_and_comics_comparison71tnr.pdf
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/3804843.pdf
    • http://amsidgi.xyz/23200462345qmkz3.pdf
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/kejutedo.pdf
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/rutumorarofavi.pdf
    • https://zelewebekosol.weebly.com/uploads/1/3/4/6/134638009/4a8b16cc5a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_213232d612b3476298f41f29dba68caf.pdf?index=true
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_e8a9c6601a78450f81f4b70e1ca1bcce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/274fa324-61e7-485c-bdb4-5e22f0b9a662/timukadulunika.pdf
    • https://uploads.strikinglycdn.com/files/26cc581d-d12f-46d9-ab5c-b68931b34d6c/48116713221.pdf
    • https://uploads.strikinglycdn.com/files/ed06f4b3-00ba-427d-a635-ff8161c21c78/gupadim.pdf
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_c1d54b87d0754f09bde452b6b35ad5db.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_d33800bffb814693863c4796600d068b.pdf?index=true
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_2edc604dca6e4c77b0335eab1a33dcd5.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb02.bin
ed6c06d6b53978ec5f96115836d86714082605a138a35c13a5cbff3bca8029fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 4912 bytes
font_01_sfnt_off0000fbc5.bin
6797fa50cdf0e46f8e576d497c4a7ca27efbb3787c1ceafd9fffb96ba151637e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 10184 bytes
font_02_sfnt_off00011e97.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 4324 bytes

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