Malicious PDF — malware analysis report

Static analysis result for SHA-256 3911105a3176da76…

MALICIOUS

PDF

75.6 KB Created: 2021-05-10 01:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1993c2736db04673656366b14b8365ff SHA-1: 24c6537139b34a67df470e3cb6b785a7ba923880 SHA-256: 3911105a3176da7647e9eabf6d662fff1a9dd10d36f8cb172dc129a99e579cdd
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'zajinet.ru', suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to redirect users to various external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=how+to+identify+aeron+chair PDF link annotation
    • http://ziwavabewite.66ghz.com/vatub.pdfIn PDF document text
    • http://difanogoz.22web.org/xidagirikodakebilitonuwux.pdfIn PDF document text
    • https://dabelebixoxo.weebly.com/uploads/1/3/5/3/135310161/bec3aea84761c3.pdfIn PDF document text
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/sifidopa.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/gidavirukubofejisi.pdfIn PDF document text
    • http://namibav.iblogger.org/small_conversion_ppt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://neduweleviwov.rf.gd/ukulele_songs_2020.pdfIn PDF document text
    • http://fakabanulup.rf.gd/83793271771.pdfIn PDF document text
    • http://kiviritibudemo.epizy.com/anterior_knee_pain_scale.pdfIn PDF document text
    • http://vowariki.rf.gd/kai_sa_guide_9._8.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/91586606236.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_116407d64b77448ab79519c6e4058870.pdf?index=trueIn PDF document text
    • http://deroluzotuz.epizy.com/job_application_letter_format_gujarati.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_c9bc3977882148179a20188a2a8a26cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/what_is_public_administration_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/binalewala_lyrics_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/42337414193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e89547-1fd8-4b71-bfe6-c69102ce6cf4/reading_comprehension_worksheets_for_2nd_grade_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c99fe8-3130-411d-84d5-7364ee5e70e4/kefegejuragowajizu.pdfIn PDF document text
    • http://nitusul.rf.gd/nomaf.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_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 5056 bytes
SHA-256: 102355783d3c63ccd10e912760752ad82945e7230e5dc412e44e9becf20826a2
font_01_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 11448 bytes
SHA-256: 4054b39cf883bcf9d71f1e0e6643365275b16ee2881baf5dd5630acebf321e05

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