Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f94041cdbe49f1…

MALICIOUS

PDF

88.2 KB Created: 2021-01-05 06:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 05ac2b2d20ce6af981dcd49b05fc3662 SHA-1: 86c3c819d125aa7c7362bb40b94ee262241e5b8a SHA-256: 84f94041cdbe49f1b6db0b742bf9e3549134bc9f63b0d2d6649722ed796b314b
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=ihcl+annual+report+2018-+19 In PDF document text
    • https://cdn.sqhk.co/dawezizupata/ihjaOjj/jifedivojun.pdfIn PDF document text
    • https://cdn.sqhk.co/refowofiros/hdgdief/67387523396.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/ihjbjcv/75329141249.pdfIn PDF document text
    • https://cdn.sqhk.co/telapunojawu/2gcvjds/roxeworisuseli.pdfIn PDF document text
    • https://vezuwuzasulibe.weebly.com/uploads/1/3/4/3/134354720/gupewetovil.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/ec411e03-2c1c-4a69-93f9-5a7089ab02f6/39684023979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11ed8df-80db-49ea-9e90-1a2c45c8b62e/12664958807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a9f9c84-34df-4f6a-b5f5-77c149c27e1c/you_can_negotiate_anything_by_herb_cohen_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68fa8e86-99f6-4fd1-9f98-7c35243f0b7a/21548720917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07cad6f-c04a-4c10-a744-c07ac26a06a1/libefumogiruxapisosuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/6926811430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e41b897-457f-431d-9d42-d8483669c4f2/big_the_cat_froggy.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/graves_mid_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00200891-f7e3-4f97-aeb1-cf905081beac/toshiba_fire_tv_edition_43_manual.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_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 5488 bytes
SHA-256: 487d1218ecf0fc068ddce7cfbc5e3758c7d46fbbb9d44b8d8aa6cc351f5074d0
font_01_sfnt_off00012dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC5 11240 bytes
SHA-256: bbd2b49d506ae5b2f1b786daf8021c58528bdf8838687bef632b4cf5d2607a5a

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