Malicious PDF — malware analysis report

Static analysis result for SHA-256 7251932a4c551eb1…

MALICIOUS

PDF

66.1 KB Created: 2020-12-17 14:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 8540c264197c5ac4450c1a1437ed3096 SHA-1: 8ee20e8ff2b7aed3815b707c1d05a70940c6e2c8 SHA-256: 7251932a4c551eb1e48e0579b5f20df2d853e04f68f98a2052b765e99ebeda8f
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea that the links are the primary malicious component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=concept+map+digestive+system+life+science+book+b PDF link annotation
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/5f2bd71c7b11.pdfIn PDF document text
    • https://kejijasorakabil.weebly.com/uploads/1/3/4/3/134311956/serisabepi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fce157f73142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455914/normal_5fbebf4b3a603.pdfIn PDF document text
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/nugerujovig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/duval_county_child_visitation_guidelines.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc545c1084698658e7b29ac/t/5fcd70b724c49707d3341bce/1607299258229/vice_news_today_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b2b307-7a1d-489c-9c06-62fd4058cac4/94605168930.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/19382244100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a92104d-2a2b-467b-bf7c-3ee5e09b6082/hollywood_bowl_super_seats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dba98f0-ca0b-4de9-8ce5-e927669684ce/one_step_equations_with_integers_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a051a65c-38b7-4f83-a659-e61072a416fc/peduto.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_off0000c49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49D 5652 bytes
SHA-256: 848c96a6e8fcceac239c4cedbebef4d61eee02f7385322347156dd3dcadc1389
font_01_sfnt_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 10704 bytes
SHA-256: 34be92a9f42580f6a57ea2c5cb3b80773cf3867a76e057969b51dbf9c22c40df

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