Malicious PDF — malware analysis report

Static analysis result for SHA-256 20663c36e9880ec4…

MALICIOUS

PDF

70.3 KB Created: 2020-11-10 04:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 52d34a99aba58a4ca227f37bca8d452d SHA-1: 4e3a04f0b8078c1cc38ff0f478b8c2ee29a30c4e SHA-256: 20663c36e9880ec429b3ca6e6e8ca29650ee6e5ab0cd4aeb1d7858df33c62564
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and point to redirectors. The heuristic firings indicate it's a malicious redirector and a link farm, likely designed to lead users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?keyword=mis+webmail+portal In PDF document text
    • https://sizegetode.weebly.com/uploads/1/3/4/3/134309939/8014661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f870624a85ad.pdfIn PDF document text
    • https://sodumixiseto.weebly.com/uploads/1/3/4/3/134311801/8750379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_5fa9bf6e9d803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5f9ab2a4c0630.pdfIn PDF document text
    • https://pisefipekopaz.weebly.com/uploads/1/3/4/4/134461515/8b391a9d.pdfIn PDF document text
    • https://sumozizadux.weebly.com/uploads/1/3/4/2/134266097/ea29b21f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5f91e4a7bb765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_5f949da5e0650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fa92abf1ee7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_5f9920876ba60.pdfIn PDF document text
    • https://juboxunogaruf.weebly.com/uploads/1/3/4/7/134700559/ae80a0dfad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cd0cbdfe-15dc-4d4f-9e8b-d788956b1d0f/45453566195.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/1714485674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/105507b2-c21f-4e77-a7b0-86afb71f758f/36178339338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/045a9195-1521-4683-a691-ee0b9abdccb7/94273258531.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/51078062924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c49f77-768c-4e3c-a589-dfaec0e99373/16253842374.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B5 6336 bytes
SHA-256: 23b3f72cb6ec76f9bc64452442f6daacfd96d026cb3a05ca2e43bd61cb404b45
font_01_sfnt_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 4884 bytes
SHA-256: 4194030f489dede78edf4fdb5c9da21a7d2347b0dd5b544ab9d2b4069a0fc9ae
font_02_sfnt_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 9888 bytes
SHA-256: 6295994386e9b13ace96ddfe816b5e309b0ee1884885cec00da113b9558d564e
font_03_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f