Malicious PDF — malware analysis report

Static analysis result for SHA-256 279ac7a173588ea3…

MALICIOUS

PDF

75.8 KB Created: 2021-03-12 00:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7f81083fde902e9b078fd72b38d7dfb7 SHA-1: b25f88776c5ccb13c917130c5d300c7dd59f6ede SHA-256: 279ac7a173588ea3717096b0ea68e176d457bed18d3bb028274fd31f3d1145d4
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious sites. The presence of a UTM redirector URL strongly suggests a phishing or spamming campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/strik?utm_term=le+petit+prince+montblanc+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404955/normal_5fe8b3c5ee540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5ff2e608af2ef.pdfIn PDF document text
    • https://wixofixun.weebly.com/uploads/1/3/1/3/131379115/4efe0cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_601073c735cba.pdfIn PDF document text
    • http://sosiwuro.iblogger.org/blood_bowl_2_spp_farming.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497075/normal_600addfb71a85.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/2097676.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_5b8fe6422c71424298c5c2a987a450db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fivebo/fovaw.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_ccd1b840b1344657b14b5e973692af14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijudow/microsoft_spider_solitaire._exe.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/duke_blue_devils_basketball_calendar.pdfIn PDF document text
    • http://jifafir.epizy.com/balderdash_game_cards.pdfIn PDF document text
    • http://vijanemafe.rf.gd/calculus_and_vectors_12.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/votegesiteturade.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/96938533690.pdfIn PDF document text
    • http://nejotuwusa.rf.gd/xomikaguzof.pdfIn PDF document text
    • http://pavirej.rf.gd/sirexitugojimedivak.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_a351a16c2b4142388365bfa7c1d0b717.pdf?index=trueIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_6b75b8efc6e04dc3ba8860c6b1c81043.pdf?index=trueIn PDF document text
    • http://zegisaxan.rf.gd/powerbeats2_wireless_manual.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_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 4980 bytes
SHA-256: f198d2c7c5fd43f418260e7edfc628d7fb3b15e471b40019bcba9e311811ce98
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 11228 bytes
SHA-256: 4b29e88778afc26aae7ed76d637c96ffb6e2f163e4364ff3bbf20716b7327fb6

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