Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f6c6d9f05033d6…

MALICIOUS

PDF

77.9 KB Created: 2020-11-14 09:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7c56d0ac5d7587ab5208e372d147843b SHA-1: 29b348db4504497b8e3de9467ff8f69894954f77 SHA-256: f3f6c6d9f05033d66d80f7d4fa5f75eaa1d8f904aaea6d8f6cec3384a5c50166
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffset.ru/123?utm_term=army+ssd1+exam+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5faf7dbd6267b.pdfIn PDF document text
    • https://bemogipe.weebly.com/uploads/1/3/4/3/134379528/aaa9e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5fa22d349b5b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5fac34a0b1297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f8f617fdb321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_5fac21ef04f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5f99ff7fb9cbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5faf376f5da4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5f926278864d1.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/c64c8e66-1187-4b37-a386-c1aebb140404/dulita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/952ff6ec-24fe-4847-a64d-6a30dd36da3e/87295747478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d086435-4d7e-4272-87e3-9f063b134401/9609853045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47dfe73-34af-454e-8874-be53c38d0e19/nisiloxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc67e669-2c2f-4779-a145-bd220db3169e/yard_machine_by_mtd_manual_models_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2025be0-955d-477d-ab02-d3bc14f325a3/multiple_choice_answer_sheet_1-40.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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 5240 bytes
SHA-256: 7fe051e7340ac8cefd2247d63d4fd16a03e1b443c3a6f7acd280f64c5c3e035c
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 11632 bytes
SHA-256: 533f72ee9dcadeff227c1ca652f4b3a747887f693513d7d2efc3e4a6be0a4458

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