Malicious PDF — malware analysis report

Static analysis result for SHA-256 3042796090296cd4…

MALICIOUS

PDF

94.5 KB Created: 2021-03-01 10:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1f0080a376699a46ded10b69857d2e74 SHA-1: 500bed8437e15f40ac15ad1d930873fadfd90043 SHA-256: 3042796090296cd484865bab448644f6ebb318eb3aac5d539f9216c2caa39875
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to lead users to harmful content.

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://mezovuduw.ru/strik?utm_term=what+to+say+to+a+catholic+when+someone+dies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368242/normal_6019f44e2275e.pdfIn PDF document text
    • https://pusixeraz.weebly.com/uploads/1/3/2/6/132681440/4263151.pdfIn PDF document text
    • http://lnstagram-helping.live/tip_top_meats_fish_marketk77i6.pdfIn PDF document text
    • https://jotegeposopema.weebly.com/uploads/1/3/4/7/134743683/xowirelazite_vogezumogafu_lafixa.pdfIn PDF document text
    • https://dutajedi.weebly.com/uploads/1/3/5/9/135964159/21b9096a.pdfIn PDF document text
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/050bc1161a8a69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427544/normal_5ff674fc73c6e.pdfIn PDF document text
    • https://davijune.weebly.com/uploads/1/3/5/3/135315517/kulirigapi_mamoxa_salaxozej.pdfIn PDF document text
    • https://sifijaxamop.weebly.com/uploads/1/3/4/3/134332722/3278d5eb342ba.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/wekewafunupotib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fd67947dedaf.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/ji6hhJ8/wugufarir.pdfIn PDF document text
    • https://binikefesomeb.weebly.com/uploads/1/3/5/3/135386190/dimizusejokoruluka.pdfIn PDF document text
    • https://gojaxuwawozupu.weebly.com/uploads/1/3/1/0/131070912/sameferujimofumod.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
    • http://latevafizatum.rf.gd/62755240979.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_off000128ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 5076 bytes
SHA-256: 46a351bbff7acb60b8da924180e7483209be38146b8734181070b63270494ccc
font_01_sfnt_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 10648 bytes
SHA-256: 8a2f79202e0572bc386fe1822625725b9afde6047c8b4440f9dd8c16124f7ea9
font_02_sfnt_off00015e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E5D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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