Malicious PDF — malware analysis report

Static analysis result for SHA-256 1859773217a9ad6b…

MALICIOUS

PDF

78.9 KB Created: 2021-05-19 05:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4bd0368ec4f93aa173bde99dde2f95d3 SHA-1: eccc0feed7fbeb4e161869fd3d72e9a0dc46c387 SHA-256: 1859773217a9ad6ba6c6340e3421c7e1936ab0b6c627dd9920e65a04873d1cd1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

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://fokemale.ru/strik?utm_term=correlative+conjunctions+worksheets+for+grade+4 PDF link annotation
    • https://setovejuno.weebly.com/uploads/1/3/2/6/132682792/405746.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409409/normal_5fec9ab84ee96.pdfIn PDF document text
    • https://wimatuzufuduwo.weebly.com/uploads/1/3/1/8/131871585/goxito_wovujog_vajelunikunikuw.pdfIn PDF document text
    • http://pegajopakazo.22web.org/is_this_love_whatsapp_status_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_602c34a60ef98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423772/normal_6000b942c6b55.pdfIn PDF document text
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/3354881.pdfIn PDF document text
    • https://disebaxixifos.weebly.com/uploads/1/3/4/7/134714932/natinige.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/9759580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5ff65015e36c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491175/normal_6064fb6403326.pdfIn PDF document text
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/560369.pdfIn PDF document text
    • https://femesizexib.weebly.com/uploads/1/3/4/0/134018571/nopirulaza-vuvimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://libogesozi.rf.gd/21943359007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11cfa12a-e6f5-4fe4-89e7-2666bd354781/scooby_doo_2_spooky_island_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b186b1-f38c-4a28-b50f-77c254035da7/1339721090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d514ee-eaaf-4516-a1ef-09e3d2f55d00/black_swan_theory_nassim_nicholas_taleb.pdfIn PDF document text
    • http://xutududigerupe.epizy.com/88786079731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c79df16-8266-4ed6-a788-bf6eb55a6aab/takaloba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76715f9c-7dc6-4107-a4b6-40ed423f1edb/patrones_fofuchas_planas_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00be60c9-c6c1-4c7a-b250-a558bbcf4edc/luxew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc364e42-f238-47d3-91d6-ad7552c9fee3/96419245391.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_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 5568 bytes
SHA-256: 72ca12ca1a6184a2c816b03152a6770bc1747784fc71a5ba09f9b09cc587d5c3
font_01_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 11148 bytes
SHA-256: 9876b8a905e95deb7c2c0b17bf06ee0622faf1c1c4de1b859f38a2984392c65a