Malicious PDF — malware analysis report

Static analysis result for SHA-256 8499382063a18367…

MALICIOUS

PDF

73.5 KB Created: 2020-11-14 19:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f15caf3e083c6640976feaad33eedbe1 SHA-1: d47f5dee75a9c2072075a4b07a2d971b0c7f7e69 SHA-256: 8499382063a183673b37d1395652cde6997143acd490681b3fef1b3ffa2a8a0a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/aws?utm_term=photo+blender+app++for+android PDF link annotation
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/7322073.pdfIn PDF document text
    • https://tenasusuboziwid.weebly.com/uploads/1/3/4/3/134349012/9526591.pdfIn PDF document text
    • https://jawemojope.weebly.com/uploads/1/3/4/3/134399256/e9e2b.pdfIn PDF document text
    • https://xuxutisunabase.weebly.com/uploads/1/3/4/5/134506464/kagapokuduwafaz_xunuledaviki_pidugadijefasof_mamokovufada.pdfIn PDF document text
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/vulaxon-kapofe-nevapojejetefe-wejoverukin.pdfIn PDF document text
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/3bbdbff9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_5fa73a4fecdd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_5fa06cb82b87c.pdfIn PDF document text
    • https://vuvajufuzuno.weebly.com/uploads/1/3/4/4/134480129/f67f0fa4d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5fa7d8c6f06a0.pdfIn PDF document text
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/malik_nobojotasekubad_zobujotawod.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/libowebujakux/ozone_layer_worksheets_grade_6.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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 5092 bytes
SHA-256: 695a620c1ca065b67897d1edbbc8f78572688b4a3940abcc06204bcc45f47ded
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 10028 bytes
SHA-256: 35ed91ac0f5afd14e30ce2cd35cffc90b73d80d56710d7d9d4eb20e4c7686f4c

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