Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cb3084f886c87a…

MALICIOUS

PDF

61.5 KB Created: 2020-12-25 18:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 55baf97d0e1982a6cdce492ba18ec7cb SHA-1: 9bef6e4f8bfb8b682e85e8abd8b27f1fa3b9067b SHA-256: a9cb3084f886c87a51352922e919a675d3f684475d973c7b5ec16884100bbf54
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary lure appears to be related to 'Bmw cafe racer 1000cc', suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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://gettraff.ru/strik?utm_term=bmw+cafe+racer+1000cc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5fd2fefa6d492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5fb6e728b2645.pdfIn PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/9610674.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/RZkRuBH/latadoduzobavarapajebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ragejufa/steam_keeps_saying_stopping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b53eed4-61cb-4074-a13c-22e0efa9f9dd/44769076691.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/nizinazowewukorewalude.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/sidisavasinulovujazig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883303b0-ec61-473c-b175-a9ce7a6cd129/bugigew.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/fapefemigemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5eb5f2a-8d6b-4a47-b52d-63f20d7614a6/pupebifanunigibekaxukel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae27f45f-aec5-4881-9ade-bd2fe76938cd/exercises_present_simple_negative_pd.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42D 5152 bytes
SHA-256: 2fcf2622952ff92d5b541e45a0004342d5de4a669e21467421b62db3073c0616
font_01_sfnt_off0000c5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B9 10604 bytes
SHA-256: fdcd4183f1e873fb5634316e3d3aba0893e29e6e2d0a32e86b3bbe4d995c956a

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