Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03c1a16c53793ed…

MALICIOUS

PDF

58.6 KB Created: 2020-12-18 17:09:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e2857d64154f6e1a994f053ff0db3a28 SHA-1: e2cb63879a9ce6434190f7ed164a1d00a302791c SHA-256: f03c1a16c53793edde02890aca781967aa49c86cb31cf3e86a7af069403450c6
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 a link farm, specifically pointing to a redirector URL. The embedded URLs and the ML classifier strongly suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to a PDF download lure, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=jamey+aebersold+volume+54+maiden+voyage+pdf In PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/7818348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411681/normal_5fc738508b370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_5fd0edb40de50.pdfIn PDF document text
    • https://fetoviwenibade.weebly.com/uploads/1/3/4/7/134701039/verakufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b1d8fc-106a-4f6f-99de-971abd3f9ceb/lady_of_pain_miniature.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/11293224024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeaa0763-eafa-4e46-af26-45cc65a9583d/39191533110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff7acde-6e26-4c10-943c-43bdfbd47172/definicion_de_compras_segun_varios_autores.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/human_virology_collier_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce54702-46b3-4fd5-a111-156e71493a60/kobuxumufinesamavur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d4a8e4-f027-45e1-a714-b7a50468d13b/bugs_bunny_football_game_unblocked.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 3

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_off0000a903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA903 5864 bytes
SHA-256: 5fd811938a41d0e325459aea90b1c6a12fe620251bd58898f1bcdaeb25d243e9
font_01_sfnt_off0000bcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF3 9644 bytes
SHA-256: d2630446f45cd449baa3a029377ced740d97c16824b8461415bc2d2370ff3ee7

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