Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe37b74eedf3809e…

MALICIOUS

PDF

92.4 KB Created: 2021-01-05 15:00:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6cc7c19ad4833547859bcfe95ef387ff SHA-1: 8b4973974b6a6e2c26f55a784ea652b22697e93a SHA-256: fe37b74eedf3809e46a51dd0569543bd801f1a5aa8adcd87394ce2c6f3a324d5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV specifically flagging it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest a phishing or malicious redirection scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=what+is+stock+character+in+spanish PDF link annotation
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/4029c.pdfIn PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/35e455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_5fad9eb60a92b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_5fb38415c3380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f9e0c8dba961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427273/normal_5f9e76df79e9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485935/normal_5fcd38e00f7a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f8ae5e9b3dbe.pdfIn PDF document text
    • https://vavinaxedekofew.weebly.com/uploads/1/3/0/9/130969509/wulewuragogadedem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387821/normal_5fcc3eca6213b.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/8ab0b57.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/dinisemowoge/46606594504.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/123_hp_com_setup_4520.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/latest_hollywood_movies_2018_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82549c8-7f8e-49a2-9da7-2110a518afa3/xeribebivulen.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/43890484467.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/14676666508.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_off00012e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0A 5064 bytes
SHA-256: 892387d3bc0ce4cb5eeb3cdc8ea1309ec334cdf47ae831f613ed603176db44b0
font_01_sfnt_off00013f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4D 11200 bytes
SHA-256: c6e377f235224209b86249328937983790d45996752424f0949cb4d3df2b0c32

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