Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5619f2d68a1831…

MALICIOUS

PDF

80.2 KB Created: 2020-11-13 14:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fa3f21b9fa0e6abeece39e6258e026f4 SHA-1: 07ce437153edb42d13547f13ce21accbea61e463 SHA-256: 4a5619f2d68a183159595530f27197f7a8f1332f25bfb129a7bacc482c2f671a
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/123?utm_term=grade+3+module+1+lesson+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f9721b0456dd.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/sinolun.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/2c9247.pdfIn PDF document text
    • https://sojasokavipives.weebly.com/uploads/1/3/4/6/134677313/914923.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7971455.pdfIn PDF document text
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/60d75e6dfad0ea.pdfIn PDF document text
    • https://zajuzuvo.weebly.com/uploads/1/3/4/4/134474050/sonatuxuv-xoxarojo-vemamedafave-movilusipi.pdfIn PDF document text
    • https://pururejipe.weebly.com/uploads/1/3/4/2/134265449/7233649.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/nidajigezu_magepijupe_libozumubelot.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://s3.amazonaws.com/mozirolinitaje/59263100134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d160ec2f-b79f-4c0f-8b80-f1a33951cd5f/home_electrical_wiring_diagram_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6d79e7-9e4a-42b8-a30f-376fd43e2a18/woruvavixuxavuduzegivikis.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/alpha_epsilon_pi_colors.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 5116 bytes
SHA-256: b7fdccf46433e76610b9062f295ca2c3816e2144af8c094dff484d6d3bb1c457
font_01_sfnt_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 11436 bytes
SHA-256: 9cfd5c1b918564199571a83b9bda044551aa3a1769f052b7f4a6a473a76aa475
font_02_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 16436 bytes
SHA-256: 0ea8b863e183b869292e2082d3349d66abfb88ca46f0a355063616e011ba510f
font_03_sfnt_off0001251a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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