Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88d41dba966e26d…

MALICIOUS

PDF

79.2 KB Created: 2021-03-03 13:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7e6b506be0365a012370443cb5e8f06 SHA-1: 93c4abb4c56a886e817efa032de11ab68db64047 SHA-256: a88d41dba966e26d2d2bc40c2af816967e27dec06f88a6670f859416e837b4c9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://jottigo.ru/123?utm_term=how+to+operate+ge+front+load+washer
    • http://momijuluxesapek.iblogger.org/lopirugu.pdf
    • https://cdn-cms.f-static.net/uploads/4443824/normal_600f91b9728bb.pdf
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/walosijowik.pdf
    • http://tilosume.iblogger.org/lujigo.pdf
    • https://cdn-cms.f-static.net/uploads/4418199/normal_5fe856d812d07.pdf
    • http://nuzenurego.22web.org/wozizugevubaxarasizoxosa.pdf
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/2019488.pdf
    • https://cdn-cms.f-static.net/uploads/4408706/normal_6018d69c858a1.pdf
    • https://static.s123-cdn-static.com/uploads/4416940/normal_5fdf051b2aa27.pdf
    • http://xesabuzusoneb.66ghz.com/xogiro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tusajemepo.epizy.com/lego_boost_robot_manual.pdf
    • http://xerofefulut.rf.gd/how_to_install_kwikset_keyless_entry.pdf
    • http://ramasewo.epizy.com/9685729253.pdf
    • http://retesatitogeli.epizy.com/internship_confirmation_letter_template.pdf
    • http://kovusilo.epizy.com/jomelepimifatew.pdf
    • http://somizifiwij.epizy.com/minister_of_correctional_services_south_africa_2019.pdf
    • http://lojuvep.epizy.com/zepoxowuxuxife.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3b.bin
88c319cd2b1ca10bfc0b4b8ded3cf1bf3df465f850753b2771f3aaa7d5c22cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 5096 bytes
font_01_sfnt_off0000fd95.bin
75a123cc3fc8be646dd519fe44db0aa07d81895877923a56a1fd372f3b0f1b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10724 bytes
font_02_sfnt_off000121c4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 4324 bytes

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