Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6091df3c05bc9b6…

MALICIOUS

PDF

71.2 KB Created: 2020-12-27 15:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4082230c61acd5c8e7e94d71c9eaae22 SHA-1: 7a53ab5664313d0cdb3238cdc9c21ab8d19a1f36 SHA-256: f6091df3c05bc9b608b00f7f3cf7ddf53afeaa2f050a948e3ffd4b77248afd97
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, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=maserati+quattroporte+2014 PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/391582.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/galokux.pdfIn PDF document text
    • https://cdn.sqhk.co/woravejafeto/J0Biggi/deluxunug.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/f5ff0c1debf79dc.pdfIn PDF document text
    • https://guzagotoxi.weebly.com/uploads/1/3/5/3/135313280/baa196a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5f9a4fd474568.pdfIn PDF document text
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/3481430.pdfIn PDF document text
    • https://cdn.sqhk.co/jamolipa/ibghYjg/gagurakufixijusivabeja.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/20e7898b660e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e2481c-40d8-4ec0-9f69-b968edae33fd/81575927861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0346f96-f560-4b09-b76a-49797c83a612/marevararojebukox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5995f4eb-2720-454e-819a-d39231a84b28/pinball_museum_arcade_asheville.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5369b29f-a9da-43ef-9169-b263b3722bfa/54735625518.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/tarjeton_consulta_anticorrupcion.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DA 5324 bytes
SHA-256: 5c2aae20f3ba7a85b30045339c674a29cc2786414d63ddaa3ffcc1b34932052c
font_01_sfnt_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 9040 bytes
SHA-256: b851c3be61a79ed2143b2ffaaf1e735fb4c68efb81db21eb6716a63d4f690922
font_02_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 10384 bytes
SHA-256: 7ed259bc114fb985163f9db0d5b7dad52090bef690e56747eebf730af08742d2

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