Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d9d5436fd18f2a…

MALICIOUS

PDF

60.2 KB Created: 2020-11-27 07:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b58cd17a403c0b2d973a1e2ef7135c33 SHA-1: 7c9c5b2be1fe715eb4f8b3a79c453317723f36d8 SHA-256: 89d9d5436fd18f2a40f97c19bc7ddf33b92ff0332f2285b6fab56101b99d8102
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://traffnew.ru/strik?utm_term=fire+cluster+ffxiv'. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=fire+cluster+ffxiv
    • https://bimelubisazabe.weebly.com/uploads/1/3/4/4/134492892/6050951.pdf
    • https://lofizalu.weebly.com/uploads/1/3/4/6/134601384/1f0c0d8afa8bb.pdf
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/posixuwexagaves-sujapumazasude-fusapo.pdf
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/484af.pdf
    • https://kapebuzuzevasa.weebly.com/uploads/1/3/4/5/134587117/gavabunedisepa.pdf
    • https://xemuputib.weebly.com/uploads/1/3/4/5/134506680/niwefugopeguwa.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/naniro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39758ab7-fd6f-44cf-86f5-b1fceff9c068/48_laws_of_power_free_download.pdf
    • https://uploads.strikinglycdn.com/files/b11461ed-2bd4-4b98-bc1d-ff4a99eb254e/26023091790.pdf
    • https://uploads.strikinglycdn.com/files/ce7bd730-cc2a-4c06-9d82-ba69da2fc56d/sesopodivejuso.pdf
    • https://uploads.strikinglycdn.com/files/cb91cd64-020f-4117-af23-5a0513005b41/26881819717.pdf
    • https://uploads.strikinglycdn.com/files/1f6fecb6-6ce5-4aed-b7e6-7a55bc7aa015/arquitectura_minimalista.pdf
    • https://uploads.strikinglycdn.com/files/4cdaa1b8-a0dc-44d9-8486-932a0490bd74/78552709715.pdf
    • https://uploads.strikinglycdn.com/files/b26b6bbe-cc28-43a2-a999-564d037606fb/industrial_refrigeration_handbook.pdf
    • https://uploads.strikinglycdn.com/files/a3d9a3e7-8ecf-4e37-9046-c06f0e4e49be/tokoxusulu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0e8.bin
fd12c907c2e0da5a028413f681f96720f47fe0dac87134e477341135311775a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E8 4748 bytes
font_01_sfnt_off0000c129.bin
80184ba7fbeb5db329ad3938d7d1c1deb12eb3aa6cdc20c4e621e020235c1478		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC129 10236 bytes

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