Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dd6136961b5b9d…

MALICIOUS

PDF

85.3 KB Created: 2021-02-17 06:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b07a8e07a657fd6aa32a5412494eceb7 SHA-1: 21817a37452b804ba3b189af773eb054870a2039 SHA-256: b8dd6136961b5b9dc0129347d76c541dd4e9602aa3058d21dfbbcb2c4cc18eec
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search term, implying it's crafted to appear as a legitimate search result to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=whirlpool+cabrio+gas+dryer+disassembly PDF link annotation
    • https://buzowupe.weebly.com/uploads/1/3/1/4/131483044/8143109.pdfIn PDF document text
    • https://fodonisegijiwos.weebly.com/uploads/1/3/1/4/131437376/fasawewa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485810/normal_60095a65d43f4.pdfIn PDF document text
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/gozat_gotunisukofezo_sokafutipodeza.pdfIn PDF document text
    • https://nazemetov.weebly.com/uploads/1/3/3/9/133997276/kukijodeguf.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/08d940bc.pdfIn PDF document text
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/zoripusake.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/mawuzepiboxogubo.pdfIn PDF document text
    • https://gorasamigizutod.weebly.com/uploads/1/3/4/6/134600185/fexak_kopeg_pilunu_rimag.pdfIn PDF document text
    • https://nofoxevejumumu.weebly.com/uploads/1/3/1/8/131857054/cd1cf4.pdfIn PDF document text
    • http://vatojaginasi.22web.org/citra_emulator_uptodown.pdfIn PDF document text
    • http://niludop.22web.org/14233473630.pdfIn PDF document text
    • https://saremugofu.weebly.com/uploads/1/3/4/0/134017097/gajenasofobupos-gegafav-kitufidip.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/4854025.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/piraregipim-buruduluni-pezarajakeja-guvukixori.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/repefuvozotowimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasezuj.rf.gd/warexu.pdfIn PDF document text
    • http://fijudixisofuzat.rf.gd/lererisipad.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_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 5744 bytes
SHA-256: 9320f8157d71b221ff6fa2bc19d313e90f69db1275ce7ba5dcd1216c2e57eb33
font_01_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 11876 bytes
SHA-256: 038c8a274b72b638bf85aa6e4a11ad29e85d1cdb9147ab47610526d832684290

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