Malicious PDF — malware analysis report

Static analysis result for SHA-256 903bee87baf52172…

MALICIOUS

PDF

99.1 KB Created: 2021-04-13 05:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9bbf7e15eec1a564e033830fc00c4b1a SHA-1: 7e16f685197434b031eb5ee6ac235c8a9239fd1e SHA-256: 903bee87baf521728492068c11f30a4709f780c2e79ce78559124ce705490b7a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The primary URL, https://ponafet.ru/strik?utm_term=wunder+von+bern+doping+hepatitis, suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure.

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://ponafet.ru/strik?utm_term=wunder+von+bern+doping+hepatitis PDF link annotation
    • https://cdn.sqhk.co/woleparos/dif4Bw7/current_epl_top_scorers_2020_21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_60144453ec138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_60649217b3033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_603d219b30f91.pdfIn PDF document text
    • http://copyrighthelpcentral.com/9777171017805j2v.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/tjbqih3/contactor_wiring_guide_for_3-_phase_motor.pdfIn PDF document text
    • http://50offshop.pro/jeliparakuxef3bben.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/gijKJjd/lagobisumavidi.pdfIn PDF document text
    • http://ilkertr.shop/filizupebid1v.pdfIn PDF document text
    • http://gezinuduwep.medianewsonline.com/alienated_america.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/jegeihG/10930271956.pdfIn PDF document text
    • http://raisinsapp.club/spiritual_meaning_of_699tzbz3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_30122fc32bf547e5a8911acccd4253c7.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/gosadasobuvoroxavodepe.pdfIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_639205936a8d4f129c73e90ddc763412.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/dnd_5e_list_of_monsters_by_type.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/donupolufuwuzozogozudeji.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/wusijukufedewizo.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/51347077577.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/66438150903.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 5284 bytes
SHA-256: ac84de6d1acb344ab031ef0cd3b51116b378d731e7854077962ee330387e49ef
font_01_sfnt_off000147cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CD 13064 bytes
SHA-256: e25cb18fccb95aabae324cf8c8c09a7fa3df3cb113cdb9ff27659e8bb9eebb85
font_02_sfnt_off00017128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17128 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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