Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a7c38795195751…

MALICIOUS

PDF

78.4 KB Created: 2021-06-11 13:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6996b588183bd85229eb5bb6b30e0e6b SHA-1: f3b795bb63419b6b724836cd51fddd27ffa9b015 SHA-256: 33a7c38795195751de806c65f21a5b00ecdd38b69556078e3f96ec812a959f56
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious intent, likely leading to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://pixomot.ru/pbw?utm_term=mou+example+template PDF link annotation
    • https://sagogekur.weebly.com/uploads/1/3/4/4/134469423/22a7f.pdfIn PDF document text
    • https://bulamudaxila.weebly.com/uploads/1/3/4/9/134903330/lopesemaleferil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_606414f8c8758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_603650ebd784f.pdfIn PDF document text
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/78170b8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501041/normal_5fe527bf23cfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mosijiv.pbworks.com/f/4787137544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e10da26-5d76-4513-80e8-a3e0e1e80abd/gepefileritupijavax.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/w/file/fetch/144808611/rebilagurowobuvodev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bfa9e8-6277-4fc0-801e-bb612df48714/what_is_the_goal_of_industrial_product_design.pdfIn PDF document text
    • http://demopefo.pbworks.com/w/file/fetch/144945564/365_days_full_movie_free_download_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9432cbff-703d-435d-a69f-892ecaa6620b/jokuvirevoramujotimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2aae6cd-07db-420a-92ef-d43359a840f4/53954650240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52de77f-bcca-4466-93e1-151ec23feca1/lobokipadubukuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7ffa3d-ba99-41c0-b31b-555f567aec1b/25058682979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372ee89c-744e-4ad6-8844-7f8546df3889/23997831560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1081873-4583-4f2e-9893-7466b6f5a8f2/tugijipasowinov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a1ef90-1908-44a6-8074-6c71b90979a4/korg_x50_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0cf9238-aba5-4d2b-9d92-671e897bba3f/33932602780.pdfIn PDF document text
    • http://sapagujedok.pbworks.com/w/file/fetch/144992580/togawofonij.pdfIn PDF document text
    • http://kepodaworo.pbworks.com/f/89750213657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8294c45-f767-4f1a-abde-17428e9a2803/78397968277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b567723a-4e26-42ad-a1c9-123a2f10f0fe/jerry_kuhnhausen_mauser.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_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 4764 bytes
SHA-256: b12ca4ac89c7204963c3de531c082f244d4911b03752b224310641818343cf0b
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 10960 bytes
SHA-256: 6f74ba4dc41f470e272023f5eeae4d85675d17d4171e8c7d39ecb94b063917a3