Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbdf49eb1c0f718…

MALICIOUS

PDF

81.9 KB Created: 2021-04-07 09:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dc05c7acfd251d0a0207e96541b1be75 SHA-1: 0a60032328768bea171c34d2356a3cdaa50d4995 SHA-256: 6cbdf49eb1c0f718aabf4ebbd6da8ad80828905e261be8669a1c498908466978
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains references to 'cloud computing interview questions and answers pdf', suggesting a lure to entice users to click the links. No scripts were extracted, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=cloud+computing+interview+questions+and+answers+pdf In PDF document text
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/rurudabalure.pdfIn PDF document text
    • https://powifamule.weebly.com/uploads/1/3/4/7/134757347/4284078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_6024135b3db38.pdfIn PDF document text
    • http://adv-workshop.site/49418183783tt9el.pdfIn PDF document text
    • http://trells.space/46611189953pjccd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413361/normal_5ff8b5e1e12f6.pdfIn PDF document text
    • http://zubiki.top/panelview_plus_1000_software_free_download6np3y.pdfIn PDF document text
    • http://nebo-baikala.ru/pebinasulatikavefig9fzb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_6049f05d6f420.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fcbde213b5f9.pdfIn PDF document text
    • https://pilopagitek.weebly.com/uploads/1/3/4/8/134856928/705877.pdfIn PDF document text
    • http://henrysavbr.site/amapiano_movement_2019s99u7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380393/normal_5fdf6844aebcd.pdfIn PDF document text
    • https://nodaveto.weebly.com/uploads/1/3/4/2/134266094/7293895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_f002de6cf02341608d3b1363bdb84463.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_347332895bcc46d181ffd9453589cdfd.pdf?index=trueIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_b66184dfba82463e91bc4dbb5c184efb.pdf?index=trueIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_91252851a971487cbb8d8e4ddf764d14.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_4488aee6f3144f4a913727983f6c508c.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_89ac28d357bf4309a95c80244666a8e8.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_55bc7a0cc5fb4259bd223d39c7155341.pdf?index=trueIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_f39513a473c54ae389eadce32057beb8.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_5562b044238c4de2aaf0c6603af3877c.pdf?index=trueIn 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_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 5660 bytes
SHA-256: 3b9841b67d6461f0c20c04d6dfd25f7b47d5681caa778e36fe0f5226da8f78c6
font_01_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 10720 bytes
SHA-256: d213d8352abb73130eb7a72677b457f1e43fb418e9828bf417233175d8e04a73

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