Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b7b6de8f979796…

MALICIOUS

PDF

115.0 KB Created: 2021-04-06 01:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 752d582cd7201c635f0151a1857ed358 SHA-1: 4e042a08a2d5afd8ac578a694a7a0f1e448a0908 SHA-256: 24b7b6de8f979796998e22341c1b76792392f5f848f5638e92cb1bd883409bda
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://xajibur.ru/strik?utm_term=journey+to+the+west+chapter+2+summary PDF link annotation
    • http://nivakagudan.22web.org/begijir.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/design_of_cmos_operational_amplifiers_rasoul_dehghani.pdfIn PDF document text
    • http://wusozupu.mypressonline.com/how_to_cook_burgers_on_cuisinart_griddler.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454575/normal_5fcd1001c9348.pdfIn PDF document text
    • http://numufubigefak.iblogger.org/nuwefakakovigat.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/R5je7ge/17763997779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_605ef574b054f.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/h0Y1Ggf/tevowonuriroxovamabibukax.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/dhhigJ3/tiki_taka_ti_spanish_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5fdcb72440d0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xavemiwikujuxuk.rf.gd/winged_sun_disk_symbol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3694c1-5581-4c0f-806d-d091d7cd2df5/dutojazi.pdfIn PDF document text
    • http://felubumasosazi.epizy.com/gafepep.pdfIn PDF document text
    • http://rugeritubaduw.epizy.com/baarish_neha_kakkar_full_hd_video.pdfIn PDF document text
    • http://vabizofolimise.epizy.com/angry_birds_2_trailer_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96877891-6267-4d76-993f-5fb2b14f99d6/the_man_without_qualities_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45c8356-0db6-463a-b7a1-c1ddd776f96c/beautiful_creatures_rio_2.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_off000147f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F1 17784 bytes
SHA-256: 83b71f6708e1e204316288b6f4ab211133146b1f879a70f8e29c2d6f38181e8c
font_01_sfnt_off00018015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18015 5456 bytes
SHA-256: e626e7f215a1755e5e1968649965dae030617b776b72794ccf12d4dcd2aec1d7
font_02_sfnt_off00019295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19295 14444 bytes
SHA-256: 9d5bf0431aa793edccf1ab13d6707ad76f8440052e6c210e253e77b9db2e77d1

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