Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e56a03d91c4aa43…

MALICIOUS

PDF

68.0 KB Created: 2020-12-19 22:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0a4e0e36e36b8e1f6e6a9875e77575b3 SHA-1: 78e73c2364afec29cba6c4226bc7ee5940ffd0cd SHA-256: 3e56a03d91c4aa430c46fda2a2f22908d44def1237f14851cd24a268908bd3d9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. One prominent URL, 'https://trafftec.ru/strik?utm_term=the+scarlet+letter+chapter+questions+and+answers', is embedded within the document, likely serving as a lure. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest potential for JavaScript execution or exploitation to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=the+scarlet+letter+chapter+questions+and+answers PDF link annotation
    • https://liletizotefos.weebly.com/uploads/1/3/4/2/134234842/2f0bf00e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5fa35816542d7.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/9961242.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/bc44ba.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/1e024e0.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/vijoravuzinopifan.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/187b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_5f916058ce07b.pdfIn PDF document text
    • https://zabodoxukuxubar.weebly.com/uploads/1/3/4/9/134904472/7288143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/89439070237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438cac22-923a-4b71-853a-92e9fd2c24d4/stardew_valley_calico_desert.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/st_francis_of_assisi_raleigh_friars_leaving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00f69c5-2923-41fa-bdfb-800c36d8248c/naming_molecular_compounds_worksheet_chemistry_if8766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a328b4e-f910-4a0f-80fb-99aa7b9b501f/hide_a_key_box.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF09 5208 bytes
SHA-256: 4a423de77617ea1327f29deb7b3ba5478ed8e595f41a1d853d76f50367828b41
font_01_sfnt_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 10348 bytes
SHA-256: f83d30f95ff01ba6b946524d4395b4464db18aa831961c0a67eba3ae4ccc36f6
font_02_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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