Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9aeab3ee1a96f2…

MALICIOUS

PDF

66.9 KB Created: 2020-12-18 08:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7c4b2a15c4cab111110da40aaa3a4f78 SHA-1: 965c49e44a28525906e9436884ad88d91030d1d5 SHA-256: 4b9aeab3ee1a96f2f376ebe11b1cb2785d795b2cf3345c1273b3f8cc59ba3145
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to redirector infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged a PDF link farm. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=standard+deviation+abbreviation+statistics In PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/fab4ee9.pdfIn PDF document text
    • https://toxekemugig.weebly.com/uploads/1/3/4/4/134484635/a75bbc.pdfIn PDF document text
    • https://voleruzogiz.weebly.com/uploads/1/3/4/6/134696629/kipojezu.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/9156572.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/ad6d416d-cf55-4002-83ff-2a15927b6048/fortnite_android_beta_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/28104246501.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/xakas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a280c0-78aa-40f5-871a-70be7304d2e8/83250390809.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/wrong_turn_3_movie_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/hindustan_ki_kasam_movie_song_bestwap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/344591d1-034e-4fdc-8146-07f0a511a8a9/came_to_believe_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/shade_garden_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06fe60b1-d4a8-495a-918b-35e12991a9c6/game_maker_language_an_in_depth_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/monosacaridos_estructura.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_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 5204 bytes
SHA-256: 72645f9b0f08554bc3e6214ad17d127485ec6da7de091f8e094ecf89286a7f3b
font_01_sfnt_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 10708 bytes
SHA-256: 1c9a1681234ee4b3e2d632b7353e891ad7e398bbabbe38d6120ce2dd225854f4

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