Malicious PDF — malware analysis report

Static analysis result for SHA-256 a455a2821f86a5ef…

MALICIOUS

PDF

73.6 KB Created: 2021-04-04 11:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fbc098c7878062be6fc64754b92b40be SHA-1: 9d176dbf5d092cbc1eb831ce8ce4c807f987dca0 SHA-256: a455a2821f86a5efe6f9548ee6dd7653cdfb87113665ba6b0a2b1d62d3ed4fd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jacksth.ru/award?keyword=pediatric+pneumonia+case+study+pdf PDF link annotation
    • http://aduo5.online/pisuxewusm2nh9.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/idheQeQ/redow.pdfIn PDF document text
    • http://xixofafil.medianewsonline.com/celestial_objects_for_common_telescopes.pdfIn PDF document text
    • https://cdn.sqhk.co/givukugitewe/ihhjdFG/4469854705.pdfIn PDF document text
    • http://pavozuketogo.mygamesonline.org/pomokomimobemi.pdfIn PDF document text
    • https://talafifu.weebly.com/uploads/1/3/4/2/134265368/pofokuxoforuxapes.pdfIn PDF document text
    • http://opticsystem.website/zunupojagoguvezorbusj.pdfIn PDF document text
    • http://sell-toclick.online/diritefukesamufekomekanw79fh.pdfIn PDF document text
    • http://nefritthebestthing.site/grade_3_english_worksheets_australiahnp7d.pdfIn PDF document text
    • http://richteam.site/lezonixenurupikhbryp.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/44757039012.pdfIn PDF document text
    • http://hardcreditcheck.info/imax_b6_mini_reviewjel9h.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/94148717478.pdfIn PDF document text
    • http://igcopyrightforhelps.com/difference_between_bose_companion_2_and_201kxtq.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/1745175.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubiluwetij.myartsonline.com/ground_to_air_signals.pdfIn PDF document text
    • http://rawonisobux.rf.gd/92542346500.pdfIn PDF document text
    • http://fetudat.epizy.com/how_to_convert_camcorder_tapes_to_computer_files.pdfIn PDF document text
    • http://ledegov.epizy.com/tex_zipper_bangladesh.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_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 5372 bytes
SHA-256: 4d847d7c90ed1b3c0b6659a97126c411e4a9119f1e4aad129e4367e882f56816
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 10696 bytes
SHA-256: bc685e8a08f992583b765fdb92a9f9d4826756210b647f1900b7b9dbc0a14ce7

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