Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0f2a734ce7f758…

MALICIOUS

PDF

78.8 KB Created: 2021-05-01 07:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79d302cedf524e6e72d11e0e369906ee SHA-1: 125209f1ef2a34d2b6b1e59440701173da30c0a9 SHA-256: 3c0f2a734ce7f758a7646e94caeba0f69ec72003a3ee50c7fce2675a0a4af89b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=annke+dn81r+default+password PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369926/normal_5ffa1046cfca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469365/normal_606d6a3e96ff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_602b7b48310c1.pdfIn PDF document text
    • https://lamonide.weebly.com/uploads/1/3/4/0/134096931/47be137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_606236924e6e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5ffe49fdb1eec.pdfIn PDF document text
    • http://maxapur.22web.org/bixeka.pdfIn PDF document text
    • http://nivakagudan.22web.org/82058903113.pdfIn PDF document text
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/9ebf24ea7ff8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_0323d7bd67304045a166aee2735e9639.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/88153055293.pdfIn PDF document text
    • http://nanaxaj.rf.gd/voneleseno.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_96056d8277f643d4a43dc49e0a18041a.pdf?index=trueIn PDF document text
    • http://xesidif.epizy.com/antivirus_avast_apk.pdfIn PDF document text
    • http://nexisaxilesa.rf.gd/going_to_vs_will_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/58275794553.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/nulafifimenesebum.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/fijumunebadinozigi.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_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 2960 bytes
SHA-256: ffe008f00bdab04e42d0fb58581e94ebe343bab047a3ea3be819508d06260cf3
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5424 bytes
SHA-256: 62c673a9b001a6135bc3655c667bbc69a0212efd763dcd20a45c5d544f5c1f4b
font_02_sfnt_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 11648 bytes
SHA-256: 0fba9b3ae2d548d741bca6ee5b72f9a16a766ebe36ad87ace580e355bd71a2fc

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