Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9e6a4321b26ee2…

MALICIOUS

PDF

66.6 KB Created: 2020-11-21 20:17:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6fb9c779562b4ee6264762ce1836067a SHA-1: 1fc44a5f7ebc5c807d7694543732967a614c22ad SHA-256: aa9e6a4321b26ee230740c279e14f41ffa95dac6a5fac426305888ad3ced5994
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a common tactic for SEO poisoning and phishing campaigns. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The embedded URLs likely lead to malicious content or further phishing attempts.

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
  • 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://trafficel.ru/aws?utm_term=jobboss+crystal+reports PDF link annotation
    • https://dujefeva.weebly.com/uploads/1/3/4/5/134589135/wujudiru-fodevanotalepo-donenoz-foxigeregajuvox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5f8c069118f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_5fb61c6084826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5fabfdefbe083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5fa572a953598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5f9f4394c4903.pdfIn PDF document text
    • https://jajipovel.weebly.com/uploads/1/3/4/5/134527293/nisuwaxanuki_xitiwu.pdfIn PDF document text
    • https://soremezu.weebly.com/uploads/1/3/1/0/131070226/vetaxige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f98be5d4ad36.pdfIn PDF document text
    • https://wowumasoz.weebly.com/uploads/1/3/4/3/134310839/6827630.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/ef865a0.pdfIn PDF document text
    • https://muborite.weebly.com/uploads/1/3/4/4/134442605/tugifevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f015da-716f-4aec-ab09-fe62f835bc60/48031480209.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_off0000c84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 5160 bytes
SHA-256: 76fe9530d0196341eb915c04c0bc37849791ba8d29dc68136db2700bf9a597f5
font_01_sfnt_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 10712 bytes
SHA-256: c11825bd2da282dc59c89580ec9c69ba581960b6ce58c5eaafae4db14101724c

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