Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c21374120704ca…

MALICIOUS

PDF

84.1 KB Created: 2021-02-02 21:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cff26244d27859d7cc09e4bdeb87cdba SHA-1: ec6842e465693192a4c49f7b3fa52f78c75bbd65 SHA-256: 80c21374120704ca9083afd27d79b58bef2f07717f9bcbd3f9e80381c1156985
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://crophysi.ru/123?utm_term=pmdg+737+ngx+tutorial+1+pdf', are likely used to redirect users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=pmdg+737+ngx+tutorial+1+pdf PDF link annotation
    • http://xusatekekosigi.iblogger.org/hillsong_worship_songs_mix.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/dihixja/soy_peor_bad_bunny_letra.pdfIn PDF document text
    • http://apsdd54gfv.xyz/vapisavetowikovogenufaput1kagi.pdfIn PDF document text
    • http://moshon.space/hockey_coaching_courses_near_meyim7d.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hKKzJT2/83196691115.pdfIn PDF document text
    • http://presentinsta.online/698061590862gson.pdfIn PDF document text
    • https://cdn.sqhk.co/fedijadika/af37DSz/capture_the_flag_book_trailer.pdfIn PDF document text
    • http://chategratis.online/dibevadosuo29ex.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/9xOgihg/weed_killer_peak_grounded.pdfIn PDF document text
    • http://newyearshop.site/fefobanebepadapefie4fmq.pdfIn PDF document text
    • http://idealica-itufficiale.website/63240214569g69hv.pdfIn PDF document text
    • http://leaninrzpd.site/408195130052pvyc.pdfIn PDF document text
    • http://soxexuv.iblogger.org/bilenemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nulabede.epizy.com/stihl_chainsaw_file_size_guide.pdfIn PDF document text
    • http://pevubisexifizo.rf.gd/guide_taille_chaussure_adidas_bebe.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/31390155686.pdfIn PDF document text
    • http://rokabimokow.rf.gd/rockstar_2011_full_movie_openload.pdfIn PDF document text
    • http://zapizuw.rf.gd/bobol_wifi_wpa_psk_android.pdfIn PDF document text
    • http://fapizof.rf.gd/23368737051.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DE 21956 bytes
SHA-256: d63afd3919954b1bcdb79024818bde16729b954d38159113222c0e560a77021e
font_01_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 5548 bytes
SHA-256: 4aac81584cea48729287a7bc9e9eca5a19625afe88ed7b85d6e679dbd1da84c4
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 10716 bytes
SHA-256: 229aae699d04a67363823c7e8f63f71b4bdc6050d46315918b287e832a2847f4

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