Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6491cefab84f84…

MALICIOUS

PDF

86.9 KB Created: 2021-02-04 09:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1414affb0d20fa3b80e3b3ebe5718326 SHA-1: 7214a5dfe1e4da02536c351004a2a5e0415025d6 SHA-256: 5c6491cefab84f847f4bc1cc3bdea6b6a4ceae9ac113dde821ec2c3aa9d29e57
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including a link farm on disposable hosting, suggests the document is designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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://seumenha.ru/123?utm_term=nyc+doe+stars+comment+codes PDF link annotation
    • http://alerma.ru/zidamubawulomedmsp89.pdfIn PDF document text
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/5794949.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/a8bc39fe1.pdfIn PDF document text
    • https://rogifegupoxixo.weebly.com/uploads/1/3/4/0/134040774/bixal_nuwapotewiruxuj.pdfIn PDF document text
    • http://idealslim-ordina.site/jajuximizageptuic.pdfIn PDF document text
    • http://lasns.fun/532024317648we5v.pdfIn PDF document text
    • http://makamar.xyz/59998507967a4btq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5ff71bf637630.pdfIn PDF document text
    • http://desenusexewu.iblogger.org/2514695615.pdfIn PDF document text
    • http://egrn-order.online/milwee_bell_schedule53nt4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458421/normal_5ffa6f126f8e3.pdfIn PDF document text
    • http://tomandbxof.site/wacom_mobilestudio_pro_13_manualemje6.pdfIn PDF document text
    • https://zopojezumaze.weebly.com/uploads/1/3/1/6/131637354/a779f1aa177c0d8.pdfIn PDF document text
    • http://trudogoliya.online/568877047392neir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465924/normal_5fc672680ffab.pdfIn PDF document text
    • http://italy-small.space/kamepeguzitixujoov6m9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voxotili.epizy.com/interior_design_and_architecture_company_profile.pdfIn PDF document text
    • http://fuvovidesom.epizy.com/cape_landform_information.pdfIn PDF document text
    • http://xeduniramabal.rf.gd/eu_christiane_f_filme_dublado.pdfIn PDF document text
    • http://zasuridedowimam.rf.gd/zitele.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_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 5124 bytes
SHA-256: 370e1913eea11c0cf4dd78c2c3f0ae9d67d23764bc7426d78d8fc8f00f88f8d3
font_01_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 14308 bytes
SHA-256: e9edbc8da3e7fe642f82ee8dbb8fd793ee617be94d1ac7169fabf8053038a104

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