Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9af79de0dcb94c…

MALICIOUS

PDF

134.4 KB Created: 2020-11-25 08:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8952ceacbed91fa29151e9ca143d229a SHA-1: 7cdf302ba9c41373a9b3f25d1d6810c0908232e2 SHA-256: ae9af79de0dcb94cb28935e0390d25f93d702b9502444a861269237e7f4da846
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafffi.ru/123?utm_term=one+piece+whitebeard', is identified as an SEO redirector, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://trafffi.ru/123?utm_term=one+piece+whitebeard PDF link annotation
    • https://jifurutirijiguj.weebly.com/uploads/1/3/4/5/134528482/kibizefi-pojirenu-zepew-kaborafuvaw.pdfIn PDF document text
    • https://xurigatunirefor.weebly.com/uploads/1/3/4/6/134635133/bojol_jetat_pufen_tedovidemunozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5f9ecf4bccfdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fa5a76db1223.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/digigitusuduk/lesson_23_homework_4.5_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/bapco_sysmark_2014_overall_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16e6f13-133c-43fd-bb1c-2bb06cd309b4/92794924175.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/fill_in_the_blank_stories_online.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/pet_fox_for_sale_in_kansas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d67c4fd-2760-46c2-820b-5cc81b1abc52/tusiwudenabagazemubop.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/85785577413.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/free_antivirus_smadav_terbaik_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0cc4c8-3400-4d40-8c93-e89d1919769b/74961754437.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2FD 4744 bytes
SHA-256: 3feb13fa83d9d5af1afcd5050168dd13a208bdfaedc0caac2212f0900b85c16a
font_01_sfnt_off0001d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D393 5212 bytes
SHA-256: 47fe71eda8cf32f9cb4421a43bd2d73e2bc0ae63504b4d4d91cc9cf5f6e0ea59
font_02_sfnt_off0001e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E54B 11336 bytes
SHA-256: e28d466cd2c4b8d7fa67f40715e532ae945c6cfb2984cdba6f4aa6948479383e