Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79b178bd2560f3d…

MALICIOUS

PDF

81.7 KB Created: 2020-12-18 02:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbf96c055caa36077a2b56c0f146e806 SHA-1: d791908c3c3627c817595429a538037656cce94b SHA-256: c79b178bd2560f3dc2053e280f9c30c23ab695ac4eb5ae4a71508074b2cc6147
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to mimic search results for popular content like books. The presence of ClamAV detection and ML classification flagging this as malicious, along with the URL structure, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=fifty+shades+darker+pdf+online
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f874ba83200c.pdf
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fa528c814cf4.pdf
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/8688672.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/filosom-lusiwikafese-jerupuxorukoti-novubolifunuw.pdf
    • https://zojokoladateru.weebly.com/uploads/1/3/4/4/134497877/76a9df5df.pdf
    • https://midusafamiriron.weebly.com/uploads/1/3/4/7/134702540/5953450.pdf
    • https://cdn-cms.f-static.net/uploads/4448727/normal_5fb643564c894.pdf
    • https://cdn-cms.f-static.net/uploads/4455180/normal_5fd17e56c0b07.pdf
    • https://torawatuxopo.weebly.com/uploads/1/3/4/3/134379163/3824595.pdf
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5f8a13d3a3fd9.pdf
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/2aa2e6d6b303b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divelatoxa/boron_nitride_nanosheet.pdf
    • https://uploads.strikinglycdn.com/files/47b0ff1f-a85e-4bc8-8160-cca9608c1149/muguvekarurelitu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010f73.bin
2836b301b2a48b0101d419156decc50bab82943717dc64d2fe4cd38c263a67f3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10F73 24588 bytes
font_00_sfnt_off0000d637.bin
cfe457273c270d7f554e4c81a887526bd5976952d8f2c69858856475593b71ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 5252 bytes
font_01_sfnt_off0000e81e.bin
43ed207c61877528e4c4b49dbb781101aea9774398d24f07d8bddc92c898f86f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 11648 bytes

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