Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c3161a24c3a9c8…

MALICIOUS

PDF

76.5 KB Created: 2021-03-08 04:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dbf6ce6e4909cfab3b078a2af5015e65 SHA-1: a5ea67c79145f7617eb288cc500552aaa9bb14a7 SHA-256: d3c3161a24c3a9c84c13fa35626d3893746ad36369a8a7694391d331aa4cf00d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to mathematical formulas, likely serving as a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=formula+del+volumen+de+un+prisma+cuadrangular PDF link annotation
    • http://fadulifakibul.medianewsonline.com/what_is_corn_and_calluses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_602249ac9784f.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/why_is_the_a_big_storm_on_jupiter_calledwertx.pdfIn PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/2805967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5ffa07c058d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_60138206bf825.pdfIn PDF document text
    • https://wuzetawitowozuz.weebly.com/uploads/1/3/1/3/131381497/5887860.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/21040476437ctjkf.pdfIn PDF document text
    • http://brumbum3.xyz/suluvifikemimakasojigjs1rc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_6041d64091b37.pdfIn PDF document text
    • http://shop50off.info/instructional_fair_inc_biology_if8765_answer_keyo5z6u.pdfIn PDF document text
    • http://portkamesto.site/60541196221xqvrs.pdfIn PDF document text
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/kogogini-nivuse.pdfIn PDF document text
    • http://znakomstva18x.site/908731886488vbj.pdfIn PDF document text
    • http://comforfemj.fun/burger_king_canada_app_apkyrkig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_60152fdc636c1.pdfIn PDF document text
    • https://refugisedenofa.weebly.com/uploads/1/3/1/3/131380322/0c36b771837e81.pdfIn PDF document text
    • https://busirapamuxojap.weebly.com/uploads/1/3/1/6/131606670/bedevefanof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fajazimigig.atwebpages.com/samsung_un55ju6500f_stand.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/satepirutov.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_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 5408 bytes
SHA-256: 3c7a796bfb193633f046df091725888fce6a156ce3764f6c864041a14a0fa1e6
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 12192 bytes
SHA-256: 580f3da95a770e81e2567ce1592596fe30b32fcc7ea7135923b84e9fc68d0381

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