Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bcb9d773740baa…

MALICIOUS

PDF

69.9 KB Created: 2020-11-23 13:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e2fe5f25dafd207bc8c01ff88293934 SHA-1: 4d850ee6e5f483751f3507153cf0d76f2e427cb5 SHA-256: 91bcb9d773740baaf035e92171038cab357a284241207eab3ecdfb1bed2b1ed4
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is part of a link farm designed to direct users to malicious sites. While no scripts were extracted, the structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=berkshire+blanket+original+microfleece+sheets
    • https://mesakejaj.weebly.com/uploads/1/3/4/7/134754162/vejorimawe.pdf
    • https://jugidemavewug.weebly.com/uploads/1/3/4/2/134265355/1470670.pdf
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fb94c22e814d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b1de53de-672d-42a1-9391-20556d35d165/delonghi_pac_a110_manual.pdf
    • https://s3.amazonaws.com/teximikamukubo/dearborn_stem_academy_uniform.pdf
    • https://uploads.strikinglycdn.com/files/00a15f91-e3df-499a-b70d-b83309bfdbf3/27091986930.pdf
    • https://s3.amazonaws.com/tiluwisulepam/boond_boond_song_roy.pdf
    • https://uploads.strikinglycdn.com/files/c7841fdd-b146-4eb5-a2cf-b19943f195e6/peparajokupavifironunawer.pdf
    • https://uploads.strikinglycdn.com/files/326172ba-b438-4b6d-bd78-30d27c59bfee/que_son_las_barreras_de_aprendizaje.pdf
    • https://uploads.strikinglycdn.com/files/2cc73821-0d33-4622-ae58-304983fc2daa/dungeons_and_dragons_5th_edition_dungeon_masters_guide.pdf
    • https://uploads.strikinglycdn.com/files/27900557-60bb-4fb0-87c7-47bae890addd/30137352106.pdf
    • https://uploads.strikinglycdn.com/files/ebcaee7c-576a-4922-8dab-e69f106d98d0/lirefevuzi.pdf
    • https://uploads.strikinglycdn.com/files/ccff82bf-5216-408f-80b0-0bda1a24d94f/dafenud.pdf
    • https://uploads.strikinglycdn.com/files/db797571-2ffa-4e1f-99c2-80f39ad910a5/ek_ladki_ko_dekha_to_aisa_laga_mp3_song_download.pdf
    • https://uploads.strikinglycdn.com/files/bf556132-3da9-4d53-abae-72f965dcb501/13.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6d.bin
c17d98c21a59eac7ba09884ab58ac846d565c50f9fc9def85d4f1a7745cb0332		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 5548 bytes
font_01_sfnt_off0000e12d.bin
1fd95d141d8ef4c4848302de8586d51d3c57d9e88307b3299deb8d08d60b5657		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 12860 bytes

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