Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc1cb32484a7480…

MALICIOUS

PDF

94.2 KB Created: 2021-03-11 16:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3e2120b74b32ab1c8880ca96e6a7cb SHA-1: 553786c4d0ea916d79a97154ecb78de4a3756eed SHA-256: abc1cb32484a7480b8d6d934443c870f44c16a438e0a1a26feb7b5d5ab76f275
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to trick users into believing they have won a prize or are due a large sum of money, requiring them to take further action, likely by clicking one of the provided links. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://xezojetit.ru/award?keyword=understanding+building+automation+systems+pdf
    • https://cdn-cms.f-static.net/uploads/4402503/normal_602e864561603.pdf
    • https://static.s123-cdn-static.com/uploads/4480884/normal_5ffb79dd2d2bb.pdf
    • http://hytri.com/zigipuzebemawefelewolo0959j.pdf
    • http://front-glass.space/kenwood_ts_440_manual_servicekoze6.pdf
    • http://istra-backwater.ru/how_to_start_a_private_investigator_business_in_ontario231cu.pdf
    • https://zosafetudosejo.weebly.com/uploads/1/3/4/6/134670517/tomoxixasezevoli.pdf
    • https://pukapukipek.weebly.com/uploads/1/3/4/6/134636258/sodum-kedususegobeve.pdf
    • http://supernefritroller.xyz/jacuzzi_whirlpool_parts_near_mehivv6.pdf
    • https://jowadukezivi.weebly.com/uploads/1/3/1/3/131379295/fojorozedugut.pdf
    • https://cdn-cms.f-static.net/uploads/4476001/normal_60460d3a6228d.pdf
    • https://static.s123-cdn-static.com/uploads/4394062/normal_5ff6296d4499b.pdf
    • https://cdn-cms.f-static.net/uploads/4450884/normal_60314ddc7d038.pdf
    • https://cdn-cms.f-static.net/uploads/4448719/normal_603e799999f35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajetufekejo/metal_gear_solid_4_pc_utorrent.pdf
    • https://s3.amazonaws.com/wazagidonux/89874230769.pdf
    • https://s3.amazonaws.com/subopukomanaw/nalezoxoridaxopujel.pdf
    • https://s3.amazonaws.com/nelizenejakarug/top_nba_draft_prospects_bleacher_report.pdf
    • https://s3.amazonaws.com/xukanomarexumu/autonics_tk4s_communication_manual.pdf
    • https://s3.amazonaws.com/kijelopazekune/gizasoba.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132b8.bin
424c53c614f784034d900d2593871b1f5c148bb37872e8a25d143c298239fdff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B8 5592 bytes
font_01_sfnt_off000145ab.bin
a9708573fce472c8d9fa7af5f204bd2b8e37974fd1bba1482095f315c53bd9cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145AB 11112 bytes

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