Malicious PDF — malware analysis report

Static analysis result for SHA-256 877e540e73b3b63c…

MALICIOUS

PDF

85.8 KB Created: 2021-03-16 04:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a232d83988c00a4ac13ae0558428d69e SHA-1: 25c327f595f629d5d0770fddcc64c4e8230b233b SHA-256: 877e540e73b3b63cdc70b8ee9a4e4016e3a99193fb976ed97023a5dfdc3c08f0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded external links pointing to various domains, suggesting a link farm or SEO poisoning tactic. The document body is heavily obfuscated and contains metadata related to PDF generation, but no clear user-facing text is discernible. The presence of numerous external links is the primary indicator of malicious intent, likely to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=wave+ceptor+manual+3140 PDF link annotation
    • http://gakmancreatures.ru/drug_abuse_among_nigerian_youthsp0h74.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/jeJMpTz/bubble_tea_flavors_near_me.pdfIn PDF document text
    • http://gromstroy.com/workplace_safety_and_insurance_appeals_tribunal_decisionsghqtt.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/gftmjdC/98423288381.pdfIn PDF document text
    • http://podarokinsta.site/true_devotion_to_mary4iltp.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/hhgiwjd/sazunibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_60375cfd8f7dc.pdfIn PDF document text
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/zebof.pdfIn PDF document text
    • https://fuliribak.weebly.com/uploads/1/3/4/6/134681530/tasadupinivumaw.pdfIn PDF document text
    • https://rebigakudaj.weebly.com/uploads/1/3/1/3/131383708/7676569.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/dTMhJdc/74232907154.pdfIn PDF document text
    • http://domensita.fun/bopasilokebofomapekusakur82g5.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/w7iiZXQ/top_offroad_4x4_simulator_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/ehhkihg/92215922514.pdfIn PDF document text
    • http://thedouche.xyz/529588617823h2ls.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/1937888.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/xiigjEf/vovuliwomozinumifotasofad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5ff067d7c4f9e.pdfIn PDF document text
    • https://gebejisidimi.weebly.com/uploads/1/3/5/3/135302949/fomewakewagodil.pdfIn PDF document text
    • http://sandwichhq.club/9545663801wp6i3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 5420 bytes
SHA-256: 3f6dd886ba689a9d0abec2ba496819f3d07ec2c1b48e63f3b3653809814bcd07
font_01_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 15756 bytes
SHA-256: b9755523799782b0e7f715ddb35336e7ea84790b161b6c009cae609d32be9072

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