Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc94c1113d341985…

MALICIOUS

PDF

72.0 KB Created: 2021-05-31 20:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 522140f6c1133865ccbd654cc6b62693 SHA-1: f32448b489680bad1e8b3ef283cf22a309430ec2 SHA-256: dc94c1113d341985d10da6627b5799c7a833986b138d9d5556c4d34447ad4886
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

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
  • 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://crewmak.ru/pbw?utm_term=2013+jeep+grand+cherokee+srt8+owners+manual PDF link annotation
    • https://parimuxuroz.weebly.com/uploads/1/3/2/6/132682994/topavupevemoge_feloleresuv_dulimura_roxuzelupofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_602a41549fd9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_60243d145871c.pdfIn PDF document text
    • https://taninuto.weebly.com/uploads/1/3/4/6/134633468/afa6dd108517.pdfIn PDF document text
    • https://kigazapaxulet.weebly.com/uploads/1/3/0/7/130774964/tebagorado.pdfIn PDF document text
    • https://kazefapakoj.weebly.com/uploads/1/3/4/6/134644741/kamazimefemes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_6049cf770416c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488558/normal_602e7e4f3329a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_60263dd8dfd69.pdfIn PDF document text
    • https://wafodefa.weebly.com/uploads/1/3/4/4/134480145/6727239.pdfIn PDF document text
    • https://depemazijibibo.weebly.com/uploads/1/3/4/8/134846300/ronesadifemobe.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/944fad89-fb0c-4c48-827f-25150ce11f42/what_is_a_lucky_bracelet.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144413490/rufegosij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7dff788-cfe5-484a-9015-a337784bdc64/best_book_to_understand_signals_and_system.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/tapovobedixaniboluzuxuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e695bd4-2cfd-4703-9991-ce71a4cc258f/74960025052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22af625-a243-4165-817c-b9d6babc229c/23095883869.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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 6308 bytes
SHA-256: 99d4f6ffe7a1dfe50d066d94b0552695d0adc37616cd05a884a8e81f0abcbee8
font_01_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 10364 bytes
SHA-256: ce5d4a419aae887218792425da4bab05aa1bfcee737be4a93ad10d789a2e985c

Open this report in the interactive analyzer, or submit your own file for analysis.