Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85e67473ba00742…

MALICIOUS

PDF

72.7 KB Created: 2021-02-18 13:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c0044c9158069f3af55c06d6514f300b SHA-1: 00c1e43f973b3f3a7be86f789b6ab2de281a20fa SHA-256: d85e67473ba00742594dba2c73f0aeded64e470d60a3efd864fcccea008d29c0
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites, potentially for further exploitation.

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://crophysi.ru/strik?utm_term=thanksgiving+day+sermon+ideas PDF link annotation
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/bikul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fe13ba608a37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5fcf5a6b2c738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_6029a9cdbbda8.pdfIn PDF document text
    • https://nezuzubes.weebly.com/uploads/1/3/5/3/135327702/zeparitej.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/62a4577c44a3.pdfIn PDF document text
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/nigojolugesoxolor.pdfIn PDF document text
    • https://zesumijiwad.weebly.com/uploads/1/3/0/7/130739983/memagagubopiva-gisozo-zafubud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fef9ee74c003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_5fe7ef11651dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_600f5807903ad.pdfIn PDF document text
    • http://mivetys.xyz/9849760261456xu1.pdfIn PDF document text
    • http://smotrikino.fun/are_fed_and_poki_still_togetherxxebm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_600d0cbe338cd.pdfIn PDF document text
    • http://8bitbeardsco.com/tunejaawi5v.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/kimalakupaj.pdfIn PDF document text
    • http://liketime.online/fallout_rpgnz433.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/7012285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pafexegud/does_amazon_kindle_support.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/47429032472.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/gukizugagazovasuzu.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_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 5384 bytes
SHA-256: 68d928cc43bd8c53a078c4df3dbd9302922c5582ceef27e7cd36f7281c55205c
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 11888 bytes
SHA-256: 24607a295e939c0662b3395ecfc33c9d8e4d60fa9878a5b6c23d1fa950b9ae49

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