Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8cc155368f52ac…

MALICIOUS

PDF

65.2 KB Created: 2020-11-20 12:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fa9206363e58a9a54ed99791832c9c0d SHA-1: 21c5a0586374341b00e4d88381dbe2a86deb7617 SHA-256: be8cc155368f52ac4e8a367a65af14cdf4f23d6f42f07a9702d75a66445e384e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish users or redirect them to malware-hosting sites. The document body itself is heavily obfuscated and appears to contain metadata rather than user-readable content.

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
  • 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://ggtraff.ru/strik?utm_term=compex+sport+elite+2.0+muscle+stimul In PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/72023f20cf017.pdfIn PDF document text
    • https://weradarodoruz.weebly.com/uploads/1/3/4/7/134744379/bf913ba1.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/22d75105e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f97e1208761b.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/82669.pdfIn PDF document text
    • https://fixivure.weebly.com/uploads/1/3/4/8/134888316/zulojokovez.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/8282837.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/8a5c10c3-b1af-4d94-a21f-a8af072299e5/35797380363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735736b9-6ca2-4568-808b-d3969dfbe6b3/jutupumefatusoganili.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/circle_of_fifths_progression_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/cdse_syllabus_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccaf0f6-c641-45d9-b3cd-b0a6fbb15e46/pinivafa.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_off0000c245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC245 5148 bytes
SHA-256: 62693b8f9a40eddcec9a4260f106d45162c4d6ad49d0b2fd076cd918916a739c
font_01_sfnt_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 11096 bytes
SHA-256: 8bf756ae524298e958911e25706ec7c3636f8a602c28db9ea605b5362092f103

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