Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c88d786dfdfd4d…

MALICIOUS

PDF

69.5 KB Created: 2020-11-25 04:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a31b5d97a0a788101e96846c90a47485 SHA-1: 1fcda0310d821976c04fb18ce6bcb10b3f294dee SHA-256: 18c88d786dfdfd4dda20e8993305c83f4558a1e1eb72bf30007dfad632c79987
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and it contains numerous embedded links. One critical heuristic indicates it's a PDF redirector link pointing to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'seven deadly sins episodes count', suggesting a lure. The presence of multiple external PDF links further supports the attack pattern of a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=seven+deadly+sins+episodes+count
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f991f356add8.pdf
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/lipifa-ruliviwunina.pdf
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/sajusel-wojowojoku-ganujoziperi.pdf
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/devuk.pdf
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5fa64d750b116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/218853ab-7c62-4dfa-9661-dcbbdcdcde27/zuguwibupelesolame.pdf
    • https://uploads.strikinglycdn.com/files/584eb4fb-b9d0-4ab5-bded-00edd8cbad8b/spss_18_indir_tamindir.pdf
    • https://uploads.strikinglycdn.com/files/577d7c1e-df61-4dc8-ade5-69578d502340/1950_ford_8n_tractor_manual_free.pdf
    • https://uploads.strikinglycdn.com/files/3d5525df-7f97-4442-967f-d783ef36521f/vowuwosiwijekirarum.pdf
    • https://s3.amazonaws.com/pexodugosa/89824668522.pdf
    • https://uploads.strikinglycdn.com/files/900298c2-6835-4858-8abb-fcabe3a232ce/solar_electricity_handbook.pdf
    • https://s3.amazonaws.com/luborinizu/67139730184.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_off0000d3d1.bin
492d57095182f6c0a294358ac4945ed1904ab93a76a363aed73ef40cc2dee61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 5236 bytes
font_01_sfnt_off0000e5c7.bin
890b82c92ec7c8393d1afea861d558f88b85706833575678449fd37306f79335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 10348 bytes

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