Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b761b33fb9ac881…

MALICIOUS

PDF

73.8 KB Created: 2021-03-26 08:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a42d97bfcb41a4bf2d34c145bed12643 SHA-1: 9da8cd4271033b9f6403396322d56a2c24af1401 SHA-256: 1b761b33fb9ac8811bd4ad21418309c35643df7fbe5a8ea8703f2b4df1767ac2
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 0.9952

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://botokaw.ru/123?utm_term=enanitos+verdes+tu+carcel+acordes+pdf PDF link annotation
    • https://pikarazumubujon.weebly.com/uploads/1/3/1/4/131452816/towogizuzokap.pdfIn PDF document text
    • http://italywow.pro/2608811115345tgd.pdfIn PDF document text
    • http://goproits.com/tribal_leadership_by_david_logan1s16p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454164/normal_60021a94d47d3.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/Qhepxhg/super_pixel_heroes_2019_apk.pdfIn PDF document text
    • http://huseyincanx.com/xakeparusikilapakuwupyjn8.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/torox.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/lafefesutegujunepul8nybs.pdfIn PDF document text
    • https://wosabizovores.weebly.com/uploads/1/3/4/5/134577485/vapuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404523/normal_5fce8b371600c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_5fe76956ab675.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/UdPgi8N/28829249448.pdfIn PDF document text
    • http://azakalaza5.xyz/dobebufowofoxaxiogd19.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/mavet_tujevavas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469365/normal_5ff64ec998a9e.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/bOYicid/steel_ball_run_race_real_life.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/idBZhiX/thoracic_surgery_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/t99iaid/12474760219.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_ca6470ca28334c04b3aaf75c3b1ad17e.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_b1b84979a8c54673ba9c711e8e10fbdd.pdf?index=trueIn PDF document text
    • http://nukisiboviwal.epizy.com/69741175536.pdfIn PDF document text
    • http://mofebuxigonewo.epizy.com/alessandro_manzoni_biografia.pdfIn PDF document text
    • http://kenalukebuv.epizy.com/tasajuzaf.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_239af3ee8ff44524a58489d560892fec.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_5a6c9ba4d51c4f2390b412223e1ff769.pdf?index=trueIn PDF document text
    • http://fekolenunegapuf.rf.gd/56373624818.pdfIn PDF document text
    • http://rojepubaxogo.epizy.com/gozukug.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_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 5164 bytes
SHA-256: e4ea07f86c392d651ed7d213a1ec209e65002edef2d2983ddbe0415ce7bf704c
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 11228 bytes
SHA-256: 6390d408ecef01c8de77af6dc19b7a3279d619d7432cffb3b9283a4083a504d8