Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d337e6d7705bc0…

MALICIOUS

PDF

85.7 KB Created: 2021-06-13 01:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 84643dc28b8f98c0f9215e2ce7b47395 SHA-1: 48ad7a438151c8089f0dc59e3ea5573792f958df SHA-256: 75d337e6d7705bc0862dd3e5118c473c2bcd41606adc4f8e7c8b45e91e3b389c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://irlanc.ru/pbw?utm_term=online+nmap+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378599/normal_602667ead0f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_60477eba97274.pdfIn PDF document text
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/tuwarulefunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_605960a18a7d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471948/normal_601bcaaf91e38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_60692b0127c29.pdfIn PDF document text
    • https://vajizekof.weebly.com/uploads/1/3/4/5/134594154/2287828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_6031fdd9ecf50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_60bb582421f5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_5fe3407dc80f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_606e76b40bc11.pdfIn PDF document text
    • https://bagugesi.weebly.com/uploads/1/3/0/7/130775983/mefukagobid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_6035b10c7a97a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gedelageke.pbworks.com/f/38005952526.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/f/how_to_overcome_retrospective_jealousy.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/w/file/fetch/144568848/ea_sports_ufc_3_pc_key.txt_download.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/31019321375.pdfIn PDF document text
    • http://bisixakab.pbworks.com/w/file/fetch/145032405/39304563525.pdfIn PDF document text
    • http://kasaxuwux.pbworks.com/f/55460664798.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/f/32161484429.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_off0001118b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 4896 bytes
SHA-256: 4610404690f71306743dd855aa1b02c7b31592ec98301b10dfb6c7a000b9d079
font_01_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 11984 bytes
SHA-256: 491113e74ff9d6570568e77457f6892d599431e5aea4d86aedc8d3f5b11b0348

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