Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c678c099e29304…

MALICIOUS

PDF

69.5 KB Created: 2021-01-20 09:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 77567667167140ef91a097a2cf65ae99 SHA-1: 78570147985d0e1bae8b9298f95393045e2615b8 SHA-256: c1c678c099e29304f15216609c16770dd967cc748b4e48805b4587b260941787
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=dragon+ball+theme+song+roblox+id PDF link annotation
    • http://fisuruwibowin.66ghz.com/22580196125.pdfIn PDF document text
    • https://site-1176622.mozfiles.com/files/1176622/33671593823.pdfIn PDF document text
    • https://site-1168052.mozfiles.com/files/1168052/balancing_equations_worksheet_10-_2.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/6358164039.pdfIn PDF document text
    • http://ronebiwoti.22web.org/alcools_apollinaire_italiano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384628/normal_5fc4f30b44d42.pdfIn PDF document text
    • https://luxefelukij.weebly.com/uploads/1/3/0/7/130775337/gogafafize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosowepexinuf.epizy.com/86383316837.pdfIn PDF document text
    • http://rakimeramut.epizy.com/domomanatenajel.pdfIn PDF document text
    • http://teruwizirazi.rf.gd/ielts_reading_word_list.pdfIn PDF document text
    • http://xabasib.rf.gd/95251561011.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/16374638383.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/begefore.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/32081082485.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_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 5448 bytes
SHA-256: 8ee936bd3bff8393786bb4346b67b6d549e486f64ca62d32bff95e2567b0f4c2
font_01_sfnt_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 11164 bytes
SHA-256: 7e9f5160d7d079812de348f07e1255557aaa4ea2d2400a256286ef3d78c3bf80

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