Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d450d4c1f646ab…

MALICIOUS

PDF

76.4 KB Created: 2020-11-21 20:11:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9ed59e4f865e28ac2a3efffcc5720f6f SHA-1: 191e1634092c63db47bf3bc79aef5369ef910f75 SHA-256: a5d450d4c1f646abf6442bf265a25aafdd937a25063eafbac14dc5238dce5810
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with several pointing to known malicious redirector infrastructure. The heuristic firings indicate this is a link farm designed to direct users to potentially harmful sites. Although no scripts were extracted, the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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
  • 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=jellicle+cats+music+sheet In PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/4589730.pdfIn PDF document text
    • https://vepezifu.weebly.com/uploads/1/3/4/2/134265798/17512775b6f85.pdfIn PDF document text
    • https://paxowamowutujaf.weebly.com/uploads/1/3/4/3/134322095/98e4fa1.pdfIn PDF document text
    • https://xefosujusiro.weebly.com/uploads/1/3/4/0/134042031/vixemepuduj_midumuzulu_lanidegapimex_duvefuxozovif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5f95ca85d35d0.pdfIn PDF document text
    • https://zafitageleg.weebly.com/uploads/1/3/4/4/134489703/wobiladuwubepu.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/10d3dbd9-0871-4c78-a2cf-b6701e4d6f3f/dark_magic_spells_dnd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc3ca4e-679f-45c2-86cd-deec092e6a9e/33273838369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d397e949-d5ba-437c-b92e-c0595ece4089/87529913979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ebada5-4184-423f-a47f-ae91a0c9df76/zanemosonojaxobokepefo.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/lawaxeki.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/bodurabaxowukeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c869cdb0-1281-4976-a6fa-8a836df8639b/99488864674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/487677f7-93ca-4b2a-88da-032370f747e6/bowatugelusa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 4932 bytes
SHA-256: aa483434e0b6032edc90f7fbf33c268e3d8e6224328f84a9984882b0523a58fa
font_01_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 11588 bytes
SHA-256: 157ce5fbae54be1ed4f807c3d85ae8121b054a025f46675afb8006f8bcd05e75
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52

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