Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31ff1b0961fd9ac…

MALICIOUS

PDF

64.4 KB Created: 2021-01-10 07:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 963c8901d498e6c1d921e50fa8c65338 SHA-1: dff954b9f4e87fd429c079819efc872d09cbac7c SHA-256: f31ff1b0961fd9ac55e6798736d62b4814c08b9412563c261f281bd87f63eb62
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one specifically pointing to 'trafftec.ru', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is structured as a link farm on disposable hosting, further supporting a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=rim+guard+xtreme+wilmington PDF link annotation
    • https://site-1168274.mozfiles.com/files/1168274/46598136006.pdfIn PDF document text
    • https://site-1173734.mozfiles.com/files/1173734/boo_at_the_zoo.pdfIn PDF document text
    • https://site-1166652.mozfiles.com/files/1166652/39320503642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5fee41aeeb072.pdfIn PDF document text
    • https://site-1176979.mozfiles.com/files/1176979/47169391304.pdfIn PDF document text
    • https://site-1188796.mozfiles.com/files/1188796/pet_2x_coins_gum_simulator_codes_wiki.pdfIn PDF document text
    • https://site-1191329.mozfiles.com/files/1191329/pedekenatola.pdfIn PDF document text
    • https://site-1177354.mozfiles.com/files/1177354/stair_dismount_2__0__10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5fbec6baa18b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_5fdaac1d784d9.pdfIn PDF document text
    • https://site-1178514.mozfiles.com/files/1178514/feasibility_study_approach.pdfIn PDF document text
    • https://site-1168354.mozfiles.com/files/1168354/pongo_and_perdita_costumes.pdfIn PDF document text
    • https://site-1175466.mozfiles.com/files/1175466/sony_crackle_apple_tv.pdfIn PDF document text
    • https://zepaxanodufinek.weebly.com/uploads/1/3/4/4/134455649/79952.pdfIn PDF document text
    • https://site-1179506.mozfiles.com/files/1179506/87147793384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1E 5136 bytes
SHA-256: 832057e092c039c4ccdc55e5f73bdd43f834ef7c989720beac3bb4b8ad2c89fa
font_01_sfnt_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 10544 bytes
SHA-256: 4a4e977bbaca31d5f8887dcd9c396b34912573a1b514bca8ff72743997647ac8

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