Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f60ecc628204fe…

MALICIOUS

PDF

76.5 KB Created: 2020-11-27 04:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2513c0661736c343ed14c0589fc0a83f SHA-1: b5036c537b7001d508368dbe7834eb4ea921b574 SHA-256: 91f60ecc628204fed297e63ce5ad8645012c077153b3f5a451cf28bab58e9186
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=surreptitious+entry+reference+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5f9f89b78565f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_5fb4055e47c5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5fbf50e08c8fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fb5c8b4b8a50.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/0775e4aa25def4.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://uploads.strikinglycdn.com/files/a25b3a54-e46c-46da-8cd9-0f114106b917/y2mate_youtube_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/zibefixuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b4f8aa-c255-4dc7-ad85-830e3a750147/gothic_1_download_free_pl.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/fazufasekupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea813f3-7b4d-4b66-bd15-a05629484b62/38448472291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8ff4c4-c2b0-456d-ac06-3df99161dd6c/ouran_host_club_characters_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/definicion_de_astronomia.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/10628418988.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/words_that_start_with_the_prefix_ium.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/55808815312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d03724e-5ba5-4373-8629-60ca8455e73c/4444251268.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_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 5388 bytes
SHA-256: bae8a8738f361eab9f30d9d372363ee2ea6b991126659dc5e02e0e903eb0b446
font_01_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 10940 bytes
SHA-256: af235518d495caf441cb13ac131bb2e2fa9f9787cf21612d07988a93dd573d12
font_02_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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