Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7feffe2362ea490…

MALICIOUS

PDF

83.9 KB Created: 2020-11-24 07:31:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6a3b04652bf07ae38458e230b5f14532 SHA-1: 9df5a4cd7075b53baf56e05254430499541915bc SHA-256: f7feffe2362ea4902d9dbc79636d4b92fe0484ed842fb2b5874b961d5e3980cf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to link farms on disposable hosting services, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the link farm heuristic further support the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=full+movie+cerita+hantu+seram+indonesia PDF link annotation
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/d29676.pdfIn PDF document text
    • https://mujubafajereked.weebly.com/uploads/1/3/4/5/134595908/gelife_varexu_sovurosofaxa_puvej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476302/normal_5fad5ec690ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_5fb492d98a249.pdfIn PDF document text
    • https://modudipagif.weebly.com/uploads/1/3/4/6/134688888/0a4cc422e.pdfIn PDF document text
    • https://jojawetoterul.weebly.com/uploads/1/3/4/4/134404105/nufukatavesukeleni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5fa7610e7be4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f93f860f23c4.pdfIn PDF document text
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/7220e4d7d5e0.pdfIn PDF document text
    • https://rimejosokodux.weebly.com/uploads/1/3/4/6/134691074/nagonesowo.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/5031293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f9a0c102fdf0.pdfIn PDF document text
    • https://dugigexufewe.weebly.com/uploads/1/3/4/3/134353006/penegumazadukoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/luropi/37880869128.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/62095443822.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/64772230527.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 5076 bytes
SHA-256: 7d780e63efc489726c6a9fa7bdd350565758de89db86a06a3938d2ebde672580
font_01_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 10416 bytes
SHA-256: 570871dbe15ee06dd1cd3771ce89afe9164d5012fb388f2af492803f2761a242
font_02_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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