Malicious PDF — malware analysis report

Static analysis result for SHA-256 96aa94f3d16ff1e9…

MALICIOUS

PDF

75.4 KB Created: 2021-03-25 22:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0fde33830ad6850b845b2ac30d452939 SHA-1: 13617efb83c9d6e445ca9d911bf0743ace862f8c SHA-256: 96aa94f3d16ff1e9f12bbb3525fe88d81735d44ec5ca49e01e7b38010f87e493
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/strik?utm_term=general+merchandise+stores+definition PDF link annotation
    • https://cdn.sqhk.co/goxobuve/gcigSge/miviborupalawa.pdfIn PDF document text
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/nivoxipino_vimonezava_wukezetejujariv_pasopukuguvok.pdfIn PDF document text
    • http://sunny-web.ru/how_did_alliances_lead_to_the_outbreak_of_ww1ti843.pdfIn PDF document text
    • https://tepidupelagoxu.weebly.com/uploads/1/3/4/4/134472529/tuxuza.pdfIn PDF document text
    • http://tufilevazoropiz.iblogger.org/dna_extraction_from_wheat_germ_lab_report.pdfIn PDF document text
    • http://viewcreditscore.info/25488232783hmylk.pdfIn PDF document text
    • https://cdn.sqhk.co/xasujuteguk/jRHooih/secondary_english_lesson_plan_template.pdfIn PDF document text
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/7336002.pdfIn PDF document text
    • https://jevilurusev.weebly.com/uploads/1/3/4/7/134749577/gotemusevopagi.pdfIn PDF document text
    • https://bufamugogok.weebly.com/uploads/1/3/3/9/133986728/7215626.pdfIn PDF document text
    • https://cdn.sqhk.co/mobubivifa/gILXgjR/bubipenamasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_a7559dbb007f461db394f04ec2afbe16.pdf?index=trueIn PDF document text
    • http://dadorisisewane.epizy.com/odia_katun_video.pdfIn PDF document text
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_b78b7836a76e461e85c92127f5f34a0c.pdf?index=trueIn PDF document text
    • http://kubitilabevovup.rf.gd/enterobacterias_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0058bb42-e69b-49c4-b267-fdf44f7182c2/roland_v_drums_td_11kv_review.pdfIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_888a0a0cd80c496ca9024456f976d985.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/952525d3-f8b0-4f71-9cf8-cab83f30ea2c/26656733390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02268be7-8d61-41dc-8b53-3b6e67d16bce/oceanic_pro_plus_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97167848-b200-4b2f-b2f0-9bb5216038bd/14947841093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fecd37e-beda-4e5a-885a-b0801e218d52/barnes_and_noble_roald_dahl_set.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_3909f8c92d9b4657b4680db83ed2075a.pdf?index=trueIn PDF document text
    • http://jupukatovukupi.rf.gd/how_to_read_piping_isometric_drawing.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_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 5292 bytes
SHA-256: 8233014a340afbbaf1bc08ef9f4afe4b380b27f8dc6de6f7a2dd12abcd1511e4
font_01_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 10452 bytes
SHA-256: b5fc2fb2bd21aa8a11f235054329a2f9d163e142d9eb7f2b053f36814d00a48c