Malicious PDF — malware analysis report

Static analysis result for SHA-256 720c647c216729ac…

MALICIOUS

PDF

73.4 KB Created: 2021-06-10 09:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4085089fd75302aed456cc32f7a2bb06 SHA-1: bb5755d1d629bcd12b0541526c922453c33ad4ca SHA-256: 720c647c216729ac451a1eedc8112a92d6b5a44fb7b28ecd37c0f4cd7274953a
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 domains and Weebly-hosted files, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://infrive.ru/pbw?utm_term=crash+mind+over+mutant+apk PDF link annotation
    • https://tuderosuf.weebly.com/uploads/1/3/4/6/134652240/5078eb41d501.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372740/normal_60084e0653d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_6042f4d87a247.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/9383539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530070/normal_6068af8b225c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426270/normal_5fff7ada3b4a3.pdfIn PDF document text
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/8599774.pdfIn PDF document text
    • https://bigamurutixigi.weebly.com/uploads/1/3/4/4/134481126/1828106.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4371788/normal_60b2681e7e3eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_606551e55b005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_600be9fb48735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_605b4a362766d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_5fe95cba1e2ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_6038c6439cf3e.pdfIn PDF document text
    • https://posalezonekat.weebly.com/uploads/1/3/4/6/134628665/wubumekapuj.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/fawigepokoto.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/65d562a4-0d1a-484a-a9d3-c9889434d06d/what_is_the_best_bible_to_get_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eea24e4-c25f-43c3-b149-248da83a8ec8/how_to_get_ultra_instinct_in_xenoverse_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703a3a8e-ebcc-4f4a-ab38-cdda7fee4389/50446098694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811fee69-763b-4dad-bd71-e03aa794d08d/what_kind_of_machines_are_at_planet_fitness.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_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 5196 bytes
SHA-256: 455b915f8985b178df5d8bc57012f8695af2e4e943c8d7881575fc9e56000d29
font_01_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 10704 bytes
SHA-256: 0476215f9c519cd03f69a8f153dcedf5492607e157ba615f7b0c585ccbac6a63