Malicious PDF — malware analysis report

Static analysis result for SHA-256 174df0bb2188a1b4…

MALICIOUS

PDF

100.0 KB Created: 2021-03-19 23:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8693b24ee14485699bbfdc764d03d363 SHA-1: 8e25f66ea7b0b1cafb262cf38814e6569261b338 SHA-256: 174df0bb2188a1b4ea1b4f1d012ddf1f7995248372202648383a434b792e85c1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or lead users to phishing sites. The embedded URLs and the heuristic firings strongly suggest the document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=osi+model+full+form+in+hindi PDF link annotation
    • http://kexedeziferu.sportsontheweb.net/mabafopevanix.pdfIn PDF document text
    • https://moketotal.weebly.com/uploads/1/3/4/3/134315425/9414e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_602743ca0dc2c.pdfIn PDF document text
    • https://kigatuxusim.weebly.com/uploads/1/3/5/3/135305206/6843183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_604aa6672c849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_60245f2d4506c.pdfIn PDF document text
    • https://lupudeme.weebly.com/uploads/1/3/1/3/131378919/922955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f812f21-59cf-4b8d-b023-2877b103301d/45777723741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73900d3e-68c7-49a4-b104-2448437afc09/zuvukukavuzamegovij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a863110-ff55-4721-9a68-d471def0d286/64631475387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d6f07e-6ea1-4443-bc67-f39371edb1c7/que_es_los_primeros_auxilios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0c92e0-e270-4a07-a508-1f47506f14d5/setugonevisuwemesugofox.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/54481601322.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/cfo_job_description.pdfIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_3eb7d3d9151e491e9d9c546e5d03797e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebfbc818-6ca0-401b-8eb8-fdf4557c03b5/91002553498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc40a3ae-f083-4e4f-bd2b-79c19983d19c/lateral_thinking_questions.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 4964 bytes
SHA-256: 38d1d82caefd1c196ffa07d18faf1953e9e0933058d773b84f4e7935859467aa
font_01_sfnt_off0001244e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00012fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB2 10292 bytes
SHA-256: c8daa0f4e0259e6bcd72d8f02952eea5c1472e40b821fed7aedf7a3938f6091e
font_03_sfnt_off00015300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15300 15260 bytes
SHA-256: 2d48a5b425fb5699d5443f529ff07003287bbb52d65ea7a84143e82257dcd453