Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc818da5b520701…

MALICIOUS

PDF

73.7 KB Created: 2021-01-12 12:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 51d10c0b278876bb8948c04b9745e6ca SHA-1: dbec2d7f47de22ff7898f82615bd77da97720ac6 SHA-256: cdc818da5b5207010cfd392b42ca4477be7a50dcfba9f1a6e0ab1020eccb4ead
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content or phishing lures. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

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/aws?utm_term=beauty+plus+camera+apk++old+version In PDF document text
    • https://gekilatati.weebly.com/uploads/1/3/4/3/134378061/696c2040.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/PYgcQgh/nujafenotu.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/5924073.pdfIn PDF document text
    • https://cdn.sqhk.co/ritafase/ijgggd0/baby_ducks_for_sale_in_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/aahgNhj/jumping_ninja_party_2_player_games_unblocked.pdfIn PDF document text
    • https://vabadagijuruka.weebly.com/uploads/1/3/1/8/131856539/bukuraneze-vekalif-zazenawuwoni-sodizuxunuzi.pdfIn PDF document text
    • https://nopirirog.weebly.com/uploads/1/3/4/2/134234714/xukososupon.pdfIn PDF document text
    • https://fajagewuw.weebly.com/uploads/1/3/4/3/134350503/bezepulituna.pdfIn PDF document text
    • https://site-1083679.mozfiles.com/files/1083679/gupugonomaziposetixazagu.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/61131ff.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/a598a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/85611523920.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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 5492 bytes
SHA-256: f5e92002e2479178104c686328a8c714b33f23875f0485e2684c94a7449b3b3e
font_01_sfnt_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 10564 bytes
SHA-256: 85cb2f5efaeda2f9a4518ebf7511258376d9f3a02beb06a05bcea61d73d6a070
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44

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