Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42e6faeff8e449e…

MALICIOUS

PDF

77.7 KB Created: 2021-01-14 13:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 15ecdd83cbe31b5befd7f1f65b5f9be6 SHA-1: 7707a2362e7a385642f2ccdfc2d90047a005c173 SHA-256: e42e6faeff8e449e3afd594d5f92458ca4812215c8e854c5c84eacaf48f66d33
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, and contains numerous links to external websites, including a known malicious redirector at 'traffine.ru'. The heuristic firings indicate it functions as a link farm designed to redirect users, likely for phishing or malware distribution. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=bizerba+scale+user+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5fda5f8b1811d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fc7b0c3a98f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f8e92177563a.pdfIn PDF document text
    • https://site-1240031.mozfiles.com/files/1240031/liguriwopesuredi.pdfIn PDF document text
    • https://site-1177426.mozfiles.com/files/1177426/ukulele_chord_diagrams.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_5f9e86c6d99be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427821/normal_5faa4ee379b97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379370/normal_5fc79e1ac1921.pdfIn PDF document text
    • https://komomagifagele.weebly.com/uploads/1/3/4/7/134705279/b82b21c37a35.pdfIn PDF document text
    • https://ruwojisu.weebly.com/uploads/1/3/1/6/131606228/filunivokarexedew.pdfIn PDF document text
    • https://site-1172801.mozfiles.com/files/1172801/vituri.pdfIn PDF document text
    • https://site-1168299.mozfiles.com/files/1168299/color_by_number_halloween_coloring_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5faa65517457c.pdfIn PDF document text
    • https://site-1168300.mozfiles.com/files/1168300/download_game_idle_tap_strongman_mod_apk.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/bejideba/norapeloganegariku.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_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 5184 bytes
SHA-256: a3a50af42f3b14afff40130a2ef485be831ed5b77ca405360e2bbfacf13d5c83
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 10908 bytes
SHA-256: 5c4ef3fa28be52821fbccbdf3efa14f6ffd0f5eb50fd054891e065bb295368f6

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