Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80ba52cdf49f112…

MALICIOUS

PDF

79.6 KB Created: 2021-04-22 23:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d38043b08355e4913aec670d1e1c0f52 SHA-1: 2a2a8ad9a7dd1a638143615e8cbb4a5927c26c55 SHA-256: c80ba52cdf49f112471ab65ff8a0932dc0c8f3f7e74b111ecfc3d94be6418859
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=how+old+is+kenmore+washer+110 PDF link annotation
    • https://cdn.sqhk.co/waxubisolo/geifhiY/fifa_world_cup_2014_all_matches_highlights.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/gRVK1id/28164973908.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/Vhehehi/how_to_push_on_ragdoll_engine_roblox_pc.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/bewabukalu_viwikak_bopudu_pabikutumumiged.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/hcIhbib/87114663129.pdfIn PDF document text
    • https://siduwibe.weebly.com/uploads/1/3/4/7/134775996/setebafefug-nuligepel-foranaji.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/sKieji8/xodoxadizuzitafimodilago.pdfIn PDF document text
    • https://cdn.sqhk.co/wevavagu/jeyhfgx/home_generator_switch_box.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://fe4fa097-7109-4367-a76b-bc1f2b7936f3.filesusr.com/ugd/ef6f93_6f6ca7302b8643a38860d0a439dc7d4e.pdf?index=trueIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_59887a1584f1420ba081c6ae915c6535.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nemafu/23142366185.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_c429cfef96344d0ab5c6b7cc97f8453b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiniruru/baixar_iroot_apk_para_android.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_9ca6a48c03174e55a7027de3732300f0.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_a04b5e97f9874a7588a96b72dcdb0b1a.pdf?index=trueIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_7bcc8df6e4fb4776977930e294027326.pdf?index=trueIn 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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 5084 bytes
SHA-256: 93391998a04ad8b40b4e75b121bfd3b6e4af2b93d15552b1bcbcf94c6cc75365
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 11108 bytes
SHA-256: 5121d42d73ddb6f148e688d1756eb12f7f9034247b31ea13861ad2ee1d53c002
font_02_sfnt_off0001233c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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