Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efd74f8a2713839…

MALICIOUS

PDF

67.5 KB Created: 2020-11-26 05:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c6d31f326eb935630546e947614dc9a3 SHA-1: 271857ce004c62e4f98b2a23d689867d45667aee SHA-256: 1efd74f8a2713839975211e38bafe1d6c34bb3fa133e1629c11ee056d6c71948
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and link farming, specifically pointing to a redirector URL that is also present in the document body. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack vector appears to be a phishing lure disguised as a search result, directing users to a malicious URL.

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://ggtraff.ru/strik?utm_term=where+to+stream+lord+of+the+rings+australia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_5fb2fb3fe9bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5f9b390ddbdc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5fbc2c8110697.pdfIn PDF document text
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/f15ff2a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5f9a02a5b628e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f870087d052c.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/lekelepowo/43411205821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64eb3530-a3d6-4906-9fcb-d65c58ab3196/lonekotiregotaxujuguz.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/motorola_h17_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nepawigexa/endocrine_system_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3a40ef-08ee-4a7f-a909-996d3b17b437/naxutiluduzoviwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2c53fe-94be-4df6-9ccf-8aae94dff527/clear_plastic_balls_to_fill.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 2

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_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 5332 bytes
SHA-256: 49ceee587fb08cd7bb607cf8319509b170f5b9b88ffd18f75d751ea1ad197aa2
font_01_sfnt_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 11084 bytes
SHA-256: 0e246d70cd9d9f6664778658b656fc53e9c30b3205633985104ba17e87cc85f1

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