Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc04ac81057c7c9d…

MALICIOUS

PDF

73.5 KB Created: 2021-01-15 12:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c14b885f417facb3fb05e6dfd9808c5f SHA-1: b6b9f207a94ff35ed08e10c51d76c6d658e8b8af SHA-256: fc04ac81057c7c9d5e4a826d903dc73521e45a0f07e71053a742b460930bb88d
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to the malicious URL, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=vietnamese+coffee+filter+draining+too+fast In PDF document text
    • https://static.s123-cdn-static.com/uploads/4481516/normal_5fd058ecbd127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f875f5aa25d0.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/6031671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5f9dd4d4f000a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5f95929030b22.pdfIn PDF document text
    • https://gemiporelowagi.weebly.com/uploads/1/3/0/7/130775846/3141450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_5faf32a071522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_5fa8669070986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_5fb5b7b326ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_5fa05d667540b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422367/normal_5fe4e9271ae39.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/1911408.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/regovadeje/gijivusef.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/bubble_bash_2_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/sri_beerappa_oggu_katha_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/96245284050.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_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 5304 bytes
SHA-256: 4fe40c59dcaa68701b068e27957f254d9d908a2492fd56de1a868145dd0ddca9
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10780 bytes
SHA-256: 0222c2df380a2c519c9f420b31ffd6500458a8545b48a077b5fe16e021ac4cf0

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