Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fae5ed56e298ac5…

MALICIOUS

PDF

69.8 KB Created: 2020-11-22 01:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f9a8cd698c1dc9c97ffb211225db7a62 SHA-1: 71c5b855979cff2c7fe939be2a7b81685e72c384 SHA-256: 7fae5ed56e298ac5e3b0a6973155cd08e6bb5f17eb221731d00a3fbf39f13879
244 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm on disposable hosting. The embedded URLs, particularly those on weebly.com and traffking.ru, are indicative of a campaign to distribute malware or conduct phishing. The ML classifier and ClamAV detection further support the malicious nature of this file.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=punnett+square+practice+problems+worksheet+answer+key In PDF document text
    • https://zolekifez.weebly.com/uploads/1/3/4/8/134850144/08543e6b.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/xiterawale.pdfIn PDF document text
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/4828278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_5fad644ff1054.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/vumojidiwodisopu.pdfIn PDF document text
    • https://pojarepuvoweru.weebly.com/uploads/1/3/3/9/133999230/7265089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_5fb7afd4a7340.pdfIn PDF document text
    • https://juvirafiwak.weebly.com/uploads/1/3/4/3/134307718/de0c46.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/26806da9-d857-4e1f-8869-602cce6e6315/mersinli_ismail_ayrilmaliyiz_mp3_indir_dur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92397599-74e1-475b-b1bd-11858aa1c111/rakejab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfb6104-388c-4b71-a62e-e9a4762ee3e3/37780397048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8da3d4b-7ebf-41ba-9032-299fc00db6a5/49140515409.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_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 5696 bytes
SHA-256: b96c252592dc4e68d05605d68d86e71cbdb3aa0597615b2df74e0d993b9e1805
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 9044 bytes
SHA-256: 04f081d47b42d70b40c49fb8370046a1a5281c0c719069512ed9890f6c591d97

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