Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d4a0c976de94a9…

MALICIOUS

PDF

84.4 KB Created: 2020-11-30 00:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 90a3321e70938b101ce6d4cbaa7b7bb4 SHA-1: b6e551ab407f3f99b70f4630fce4e70af1972df7 SHA-256: 49d4a0c976de94a9ddf0394f3ec8a9d578a2c019e31660fde9e9ac104041bb66
156 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. 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 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
  • 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.
  • 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/123?utm_term=cell+cycle+pogil+blank PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413121/normal_5f9c885e5a5d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_5f912a3c74163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_5fb74047f0021.pdfIn PDF document text
    • https://munivimisidifi.weebly.com/uploads/1/3/4/7/134772296/jilevogokuser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5fa31c07c6a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5f90cad5455ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_5f9be3a3aa4ef.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/fasanag/mamogekupigoxok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a359a97-5e52-4381-820c-d5c78951dfdf/nordictrack_exp_1000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fca3b13-bec3-4b20-bf6e-484933ab9b35/67575683771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6395518b-496a-44b9-af8f-f411f7b9be2d/52892357679.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/temple_baptist_church_hattiesburg_ms_preschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eefede1-7749-42e0-af01-663859cf03be/58335708478.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/lenovo_laptop_brightness_driver.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_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 5036 bytes
SHA-256: 4bc88b81829b4f7444e0beef518b0bc6c70a7df0f53b2a3ab33cd94635009a0d
font_01_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 10100 bytes
SHA-256: 1a514843423427222e2036785845489c6f3b98d40973a5152647ca215bc144cd

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