Malicious PDF — malware analysis report

Static analysis result for SHA-256 57776b4990affea2…

MALICIOUS

PDF

81.4 KB Created: 2021-05-11 13:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4c9a3d002098e6f29ded112448ebbd35 SHA-1: cab76c88b32c2f61c845e0c6e349e18e25adaea6 SHA-256: 57776b4990affea2df6a5319feaee10a16061de3c7cb2f071e43e0107ac06ad0
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://vilenefex.ru/strik?utm_term=predictable+revenue+book+summary PDF link annotation
    • https://cdn.sqhk.co/xikesurufa/hjdjbic/best_snapchat_filters_to_make_blue_eyes_pop.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/5YVyhjh/xebakativeraliz.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/MGMiaia/56101912714.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/jbjbou2/hand_drill_guide_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/jifUchb/angry_snake_guy.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/hhbjNkB/charades_game_show.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/0KaidQ9/54276699619.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/6qLgeeR/gojimeg.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/i2giugf/pastel_kingpin_ball_python.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/ihbgiho/dollar_tree_cerca_de_mi_area.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/jVhdgfE/green_neon_skull_hd_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/ghdhigh/pocket_veto_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_efb5108bdea14fc7bba36603b0b78daf.pdf?index=trueIn PDF document text
    • http://fezivepe.rf.gd/soresugibumovijik.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_60736d1af2554f7290d99f16b9a9215a.pdf?index=trueIn PDF document text
    • http://lonukidoni.epizy.com/sumasovilafurorax.pdfIn PDF document text
    • http://gizimup.epizy.com/moxofijabu.pdfIn PDF document text
    • http://toxawilel.epizy.com/alexa_app_please.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/76080819270.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_f960431d2fbe49ada7dc60814cfc4f76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/10804497691.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_d06572806adc43aa8b3640349242d729.pdf?index=trueIn 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_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 5452 bytes
SHA-256: 67c93769a4ed8ba2deb5569be8d0792bb6a982facd8097ad017ff57354c00e48
font_01_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 11124 bytes
SHA-256: ea64865d44fe9f35e278ed8909ab0da0de72c2aac986bca08e3d83934cf3c998