Malicious PDF — malware analysis report

Static analysis result for SHA-256 3774fca9d2021883…

MALICIOUS

PDF

73.9 KB Created: 2020-11-13 16:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43e227f6cef0b55323e5ee1ad57aca84 SHA-1: d696e5bf2504f94cb4a5c23b31af4ceb2875a074 SHA-256: 3774fca9d2021883564bdf58e447e6f936020f7e2e0f386a70cdc6e08be69080
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least two pointing to external PDFs. One of these links, 'https://cctraff.ru/aws?utm_term=association+galvus+metformine', is identified as a known malicious redirector. The presence of a link farm and the redirection to a malicious domain strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/aws?utm_term=association+galvus+metformine
    • https://cdn-cms.f-static.net/uploads/4409806/normal_5f99229bd0ba2.pdf
    • https://fukudikewug.weebly.com/uploads/1/3/4/6/134686524/1585375.pdf
    • https://xurafexejigaf.weebly.com/uploads/1/3/4/5/134588012/kenaweteretifavak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fedure/xidabanadasetijugotadap.pdf
    • https://uploads.strikinglycdn.com/files/f27b43ab-e016-4c68-a051-e92a18a5ae66/nilizogakaped.pdf
    • https://uploads.strikinglycdn.com/files/25c43a40-3e84-4a24-99d5-f4a989032761/35550654411.pdf
    • https://uploads.strikinglycdn.com/files/d3f03958-4acb-45a8-ae22-2a7570dc6b5c/sueo_de_una_noche_de_verano_shakesp.pdf
    • https://uploads.strikinglycdn.com/files/0aa3b541-4069-4653-94fd-c8545f54a960/tuserifotetara.pdf
    • https://uploads.strikinglycdn.com/files/b76683da-d059-4d7a-82d0-e90c1a784aa7/43700156627.pdf
    • https://s3.amazonaws.com/xifabilejilab/bejuzikosuzadikipas.pdf
    • https://s3.amazonaws.com/fojaxexino/supikisimegukomezal.pdf
    • https://s3.amazonaws.com/leguvefu/2965745261.pdf
    • https://uploads.strikinglycdn.com/files/c24c2042-f969-4eb6-8581-8d8599a12de1/27921747468.pdf
    • https://uploads.strikinglycdn.com/files/904f3daf-76a6-4e65-bf2f-1388bcb13826/wixenojezeli.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6de.bin
6114471c38227af23449e327348b989f95c78b6f9f51ee28e5ccd4e42c68fd33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 5132 bytes
font_01_sfnt_off0000e844.bin
4b744203c36792a42ee88843993d4d4796f10ab580dbb22ec1af11d0b57ecf65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 10768 bytes
font_02_sfnt_off00010cb0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 4324 bytes

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