Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1423dfc49904cd1…

MALICIOUS

PDF

62.0 KB Created: 2020-11-19 01:25:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a04c31d96fa7da3e3d6a3ae101a6e557 SHA-1: 95744dbaf5c6101939bb50f5b00b57710be1b728 SHA-256: c1423dfc49904cd152c1c4eb5d4bfb1ffa94127356bf9a1b1dfd4136b4230868
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs further supports a phishing or tracking objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/strik?utm_term=evinrude+trolling+motor+parts+diagram PDF link annotation
    • https://robubafo.weebly.com/uploads/1/3/4/5/134588337/e8b125289230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5f91f4234a335.pdfIn PDF document text
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/pepubigotepor.pdfIn PDF document text
    • https://bigamurutixigi.weebly.com/uploads/1/3/4/4/134481126/6947523.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/tapema.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/d73b6a65c079055.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/40a5e5.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/fogibi/80364559168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf21cbcd-1fcc-436d-af71-c6b3a72dc4bb/41213199462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e64308-e30f-4411-888e-ba45f55f05e5/15936943894.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/edward_scissorhands_2_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7673be-5c7c-4c30-b200-afb205be1d8e/23747560342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b719788-1c17-4832-845c-72e49d2d5ee8/tizavedamevif.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/indore_master_plan_2021_download.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_off0000b6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FA 5296 bytes
SHA-256: 988c02e1b1068ba88e6b6866cd3aa5e3dfacb6d5cc73d01e2767cc7407ac3278
font_01_sfnt_off0000c8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 10032 bytes
SHA-256: 9e097041975e137a4502633d5eade354c82e50f659d2279a761dd98463325235

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