Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c5c7c1e66390fe…

MALICIOUS

PDF

73.4 KB Created: 2021-03-04 03:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 23c905c4599e7f0e5861e01bf375d43d SHA-1: 7291fa2df87693ae2a01f733a5b93f309ac6a822 SHA-256: 65c5c7c1e66390fe07f44f2dd941c00328f6d631e6d1280167c6bbdc3dd79e72
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to disposable domains, many of which are likely part of a link farm designed to host malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, appears to be a lure related to search queries, suggesting an attempt to trick users into clicking malicious links. The presence of multiple critical heuristic firings related to malicious redirectors and link farms strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=what+are+some+puerto+rican+sayings In PDF document text
    • http://lnstagram-helping-centre.com/petogomesivipuzuvefifixeayltl.pdfIn PDF document text
    • http://livecopyrightverification.com/kunixafomudupisoxobstotj.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/WJl9BmZ/88204709159.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/dgdogdb/parkour_race_apk_mod.pdfIn PDF document text
    • http://electriccannoz.club/john_deere_js40_for_salecdrre.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/jf7hdhb/86805721003.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/jb2ihhg/20153061266.pdfIn PDF document text
    • http://ighelperscenter.com/512278827629eazk.pdfIn PDF document text
    • http://mrshadow.net/basanti_telugu_movie_songsmovkb.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/hbHLjtq/dreamer_supertramp_lyrics_deutsch.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/kibiduwija.pdfIn PDF document text
    • https://cdn.sqhk.co/fekurisakez/Gjigi2S/cute_animals_free_download_wallpaper.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/loxopudizus/febotilufodumolad.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/40684664062.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_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 5428 bytes
SHA-256: bf4dac92bf239b16b78bed804e80370a40924ca27d2a38ebf23f7e28f854c1a2
font_01_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 10964 bytes
SHA-256: ee2fb3805abf1fb2038126a8c49f8e271516fbd96a30b090743dc6a3d2481205

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