Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa23415f4359279…

MALICIOUS

PDF

62.7 KB Created: 2020-11-24 12:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dcddfd3ddecf0253465022322eca5499 SHA-1: 141b9e50fe554672d3fa044b79f587cc419ecaaf SHA-256: faa23415f4359279007cc6f80c8d0925f698acebfc27bdd5c36df733b41872f4
186 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 hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external URLs.

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
  • 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.
  • 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://trafffi.ru/aws?utm_term=coliformes+totales+en+placas+petrifilm PDF link annotation
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kirorafagosox.pdfIn PDF document text
    • https://xipijixulureju.weebly.com/uploads/1/3/4/3/134377958/0221a109b4c.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xipevipivefe_taposa_ruxabusev_giwudezemajeva.pdfIn PDF document text
    • https://xopubisewono.weebly.com/uploads/1/3/4/5/134507782/lamevebas_naduzosogit_mewaki_mobarejedogav.pdfIn PDF document text
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/sitasinelunazawosu.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/loninimexefob_pamazovorum_gobos_fozalebesevag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_5fb43df72732b.pdfIn PDF document text
    • https://ronukava.weebly.com/uploads/1/3/4/8/134885886/8807408.pdfIn PDF document text
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/65ce164392e7.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/dogazisuze/29337326761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16dc2500-af08-4021-8310-b9342d9132bd/rumokoromedidedabewi.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/dbt_worksheets_for_youth.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/90856736919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658bd4bb-d26c-485f-b576-361da15fc8b8/26183567132.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA8 5064 bytes
SHA-256: c1388c741f9deadf8fb269dcc54e705d0ee928b65ba9dd0b5e0f4cda3c85e61e
font_01_sfnt_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 9908 bytes
SHA-256: d32733c37736bca562cddae0c7eec1c9f6b6c8a269734eba7075af413982eaa3

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