Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96721161d379398…

MALICIOUS

PDF

62.6 KB Created: 2020-11-19 22:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 202e4bdff02771f433f7c66787c06d5f SHA-1: ec1643edc1d841e407bba8119be4ee07ff3a2b3b SHA-256: b96721161d379398bae45ad9d675b9dde18f866371c297f31d7b429da01b3ecd
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure like 'traffmen.ru'. Heuristics indicate this is a link farm designed to lure users to malicious sites, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://traffmen.ru/strik?utm_term=tableau+double+entr%25C3%25A9e+maternelle+gra In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5fb6072840429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5f8e41638125a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f86fc401ef85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421960/normal_5f98aa86d0d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f89d0d1edece.pdfIn PDF document text
    • https://zemezomar.weebly.com/uploads/1/3/4/7/134711889/netaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5fa344dcd6d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5faee0ec73cb7.pdfIn PDF document text
    • https://kidogotetivi.weebly.com/uploads/1/3/4/3/134375399/6213103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419820/normal_5f9d7e3e7307d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_5f9628f400fc0.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/nokiva/83573350072.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/47477696483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7efca7a9-edb0-4e08-a7ad-31f20febf0ee/valentines_day_meme_cards_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e493ddea-240c-4b9c-a5df-7956ab80b820/johnson_seahorse_10_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5a8d40-80cb-478d-adff-4b3dcadcab04/fnaf_3_free_games_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39e554a-e52d-49d5-9bd3-683dca010b66/13353706887.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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 5200 bytes
SHA-256: 78050087a4a593afe679e4c46e5aab9f690fc4cef340428657b066b992536153
font_01_sfnt_off0000cdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 8912 bytes
SHA-256: 7d8dcb3b89e193632a91cc0b2498240742b55843cc183e3325c032cb7fe46ef8

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