Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9b96b286a010ae…

MALICIOUS

PDF

79.1 KB Created: 2020-11-24 21:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0905f924a5e9da9dee7933084d275f6e SHA-1: 95a8dcd83e378573535599894f9effe011d5546b SHA-256: ff9b96b286a010aec2f321786b95d1758d3a46497b6b37fb59f9f73f477fa6de
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of malicious links is the primary indicator of attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/aws?utm_term=bimmercode+expert+mode+pdf In PDF document text
    • https://kipigifusulip.weebly.com/uploads/1/3/4/4/134437712/woferes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5fa1be959adff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f8d8d6a56142.pdfIn PDF document text
    • https://lozagazol.weebly.com/uploads/1/3/4/2/134266804/890415.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/7196078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f87184b0810d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5f94dc42eca12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5f9bd0219db8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5f97111c2f9b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_5fb81e030f730.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/b9c4d1e1-ff42-4c2d-814e-e8607441ceda/42091714738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fa7553-6b67-4014-9043-6cc645fd7174/twisted_book.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_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 4996 bytes
SHA-256: 4600202e1a111fd317df43170cdf1f11cff8a578608f59b45d1722651fb8dec5
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 10920 bytes
SHA-256: 535c6a9f28be86998ad3d1251e3d5c02c201bb7cb513e20f7e7c2f48c102fa82

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