Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b65da650d71b23…

MALICIOUS

PDF

86.0 KB Created: 2021-04-27 13:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9590f74818c320f48180df3bdad3b9df SHA-1: b955644d6326578f5fda2d5480149b09ebd35a23 SHA-256: a7b65da650d71b2305c962c5168b309a55d04df9a0f5f996f7296815c7b540d7
186 Risk Score

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. The file contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing attacks. The presence of embedded URLs and the overall structure strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

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://nipisod.ru/strik?utm_term=d+link+dsl+2730u+configuration+mtnl+broadband PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455185/normal_606dc817d2ee7.pdfIn PDF document text
    • https://mesedegusi.weebly.com/uploads/1/3/4/6/134600151/fenodufun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_6040186ad102b.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/webujotat.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/labodizatoviz.pdfIn PDF document text
    • http://gapokaro.mywebcommunity.org/jurnal_psikologi_behaviorisme.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/69910327388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_5fd7ed53534d2.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/nudefuged.pdfIn PDF document text
    • http://novofikupeneda.mywebcommunity.org/bunavobenenexub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_601bd27d0aa1b.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/cancer_espinocelular.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_9ace39cf5ae64315af37cfe1cb2d2db9.pdf?index=trueIn PDF document text
    • http://bokawevetejap.atwebpages.com/beauty_and_the_beast_flute.pdfIn PDF document text
    • http://movetodosewa.rf.gd/5455674455.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_466b37b8f3b74170a417e19353ca822e.pdf?index=trueIn PDF document text
    • http://fusagubo.epizy.com/artificial_neural_network_using_matlab.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/fasobagosewumogavinuto.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_c65bd77f08a24355bc199c202f70b406.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_a69fcdab1c6d45deab22d749072c3c51.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_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 6060 bytes
SHA-256: aa7627fea83f1a52a6b29be61991a12f0416eca694ef426c0b6a537f561a5f54
font_01_sfnt_off000123db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DB 10840 bytes
SHA-256: 0a528452177375372749a224273e78a795ef11446073147efd1bcd96ab8f7a25