Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f55ecf93f94b6a…

MALICIOUS

PDF

80.2 KB Created: 2020-12-25 10:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a93c86b1ff7d0fa528722099c282930c SHA-1: 924cb49eb77c69a576f2db1359469dddcc8c5124 SHA-256: c3f55ecf93f94b6a203c87b1d4a2589d4f52169b96d84ce724c58a563a99c311
244 Risk Score

Malware Insights

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

The sample is a PDF file containing a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. One of the extracted URLs, 'https://traffmen.ru/aws?utm_term=investigating+ions+worksheet+answers', is identified as a known malicious redirector. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or trojan distribution attempt.

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
  • 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.
  • 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.
  • 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://traffmen.ru/aws?utm_term=investigating+ions+worksheet+answers In PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/e73e54aabe167.pdfIn PDF document text
    • https://nigomiboxamu.weebly.com/uploads/1/3/1/1/131163879/vizufumikuranu.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/gzXiieX/borolakenubegasus.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/355adb6fa2.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/pumivunexogifinoves.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/ggyqpAe/50620327146.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/7373486.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/rakeniboz.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/c8cd58da-535c-45d7-9c16-96c7129ab9c9/the_lessons_of_history_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6d6b54-a88b-499d-b984-94aecef2ee6d/biografia_de_aurora_reyes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a85a4f2-0bef-4207-91eb-93fc22de56ab/ucc_9_301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4642454-2060-4d59-a30a-4a3980664bab/resirozaviviriwobipuxep.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_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 5068 bytes
SHA-256: 062008d38dd48e1c5fe5e2184f8ffeb1c91e3d0efe0d494e963062104121556a
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 12044 bytes
SHA-256: 9a7aa4058f5fea11e36be669be09a004269ad53c6342d866e8f1ca87362e1782

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