Malicious PDF — malware analysis report

Static analysis result for SHA-256 75331a017d40a612…

MALICIOUS

PDF

64.7 KB Created: 2020-12-17 10:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 74012122c8398948089d80415560c83a SHA-1: 7f65724b14946297adc525d37a223717904e6252 SHA-256: 75331a017d40a612858d8c190ae13aa22783d94928e41b5a45dfb1cabccf83e3
214 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The heuristic firings and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=review+meiosis+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fdb140f3c28e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5fa84cf9cdd5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_5fbbb929977f6.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/refeman_bomem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_5fa1e21be760e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f88f83e95820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_5f8ba1148ab83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0dbf0116eb00e3c4bba69/t/5fc3ad56fa04221c719055f4/1606659415982/dobif.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc116c5bdb33045eec368a4/t/5fc82acc92e74531f3c0f191/1606953676770/train_sim_world_2020_gameplay_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fe8c73-5780-4676-8bc7-f942554bf852/94392040209.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_off0000c301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC301 4904 bytes
SHA-256: 1899013f17d856511e4130ed9dae604f4be84dd6f0a9fe058a6491332010161b
font_01_sfnt_off0000d39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39D 10268 bytes
SHA-256: 06dcb7564df9223cf749a2b2861a901a1815c41719ba04b1c4cf9a2b7ee58fc0

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