Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce2cbd7ef26939c…

MALICIOUS

PDF

66.7 KB Created: 2021-02-23 06:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 692e09f16687217c04a7b59fceff5abd SHA-1: 46dfdd7ed2444c922b38cf217039a5faec076d23 SHA-256: dce2cbd7ef26939ccd8c9d08c619d613831d629edc35cbf3798abd5761622ce1
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which point to disposable hosting or known redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=verbos+para+objetivos+segun+taxonomia+de+bloom In PDF document text
    • https://cdn.sqhk.co/vofonowul/jgheQGp/ninjas_trickshotting_map_code.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/ifPhSWo/knights_of_ages.pdfIn PDF document text
    • http://xetudevera.22web.org/fovamu.pdfIn PDF document text
    • http://lemoxovuv.22web.org/siraxo.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/agfFagh/arcade_hoops_game.pdfIn PDF document text
    • https://zoparimunafixi.weebly.com/uploads/1/3/4/3/134336740/da9f58a3bc.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/PjihgjB/sequin_skater_dress_plus_size.pdfIn PDF document text
    • http://gozipoxeget.iblogger.org/malphite_jungle_guide.pdfIn PDF document text
    • https://rilopogikumifo.weebly.com/uploads/1/3/4/3/134320310/rixovizexuw.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/jg9hcje/6006485034.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/paxivogedewilu/engineering_guide_1-_300_classic_wow.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/marketing_books.pdfIn PDF document text
    • http://lujubozugib.epizy.com/7484769714.pdfIn PDF document text
    • http://bijalefopate.rf.gd/bts_run_episode_zombie.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/wilixuretadosilepoxumoliw.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_off0000c5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D8 5588 bytes
SHA-256: eb311e4034e9897d7ccff039b90adf087dca2bdc767658343c2a7d7c894b44be
font_01_sfnt_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 10692 bytes
SHA-256: 8dd0184ab0ecbc2f1221dd99ff39b968c34d9e3d03bc8a4e2eea8554fb72bab5

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