Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fff4d6424e24f4…

MALICIOUS

PDF

66.8 KB Created: 2021-01-31 14:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: e59f1d2f8ff53c1c1f0a777772bb99e1 SHA-1: 7a01a3888f8958c3e15790261d43228eac71ed6a SHA-256: 13fff4d6424e24f42816a4b3f8d1fbf1ae2aac6b2dc8517c561605f2e8ce20bb
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wb?keyword=what%20animal%20are%20you%20quiz%20for%20kids PDF link annotation
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/6559903.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixije/ihjhjed/maze_runner_monster_song.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/hcicYWG/40808725646.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476943/normal_5fe137fe28cbd.pdfIn PDF document text
    • https://wijugiretatito.weebly.com/uploads/1/3/2/8/132814958/joserasofod-veposubuzido-bozozola-defoxemanus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368223/normal_5ff62cb694ac7.pdfIn PDF document text
    • https://cdn.sqhk.co/gimanoretev/Mgdhahj/thoughts_from_heart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409248/normal_6007d0fba7012.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/0BKgjTi/battle_city_1990_download_pc.pdfIn PDF document text
    • https://fawirato.weebly.com/uploads/1/3/5/3/135392883/sogovagopilu-taxaxoselun-wakinel-kedikitamasudon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384048/normal_5fcea33c5649a.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/V4sohgT/delowumuv.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/iieunjg/xilibesuxobufibuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/itgjigc/real_bike_race_2019_winner.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/hgiedhd/test_hotlinking_protection.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 5504 bytes
SHA-256: 023e3d416211e8fc31a099c92686eeeffe855947f5998722d4f6a63779c1652f
font_01_sfnt_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10308 bytes
SHA-256: cdd1c143dab6e0d67a07cdb15e3e27c971e22e8cfcaf9f2be9346c23112395f4

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