Malicious PDF — malware analysis report

Static analysis result for SHA-256 21577397cffbad05…

MALICIOUS

PDF

119.6 KB Created: 2021-03-22 11:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ca4691f0b16c3ea242e255c34ddcb8af SHA-1: b177a2e2542207eaa5f3bee35d965b8785b1d91d SHA-256: 21577397cffbad0500e9c8ec91aab0ab1aa8b7297db15ea1f33dcc602c0c5aba
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable domains, indicating a link farm designed to distribute malware or phish users. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and ClamAV detection further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/aws?utm_term=danmachi+light+novel+volume+12+epub+download In PDF document text
    • http://creditscorehelp.info/soylent_green_torrentxw8jy.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/hcjfgcw/liwipupe.pdfIn PDF document text
    • http://snapchat-alert.com/amazing_wallpaper_3dgkfbj.pdfIn PDF document text
    • http://lnstagram-helping.live/33487208633xdrdl.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/U1kgdf3/coin_kings_free_spins_link.pdfIn PDF document text
    • http://spencermcman.us/16569809521vhgcs.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/gfieNDL/2020_bingo_party_cheats.pdfIn PDF document text
    • http://sreda.city/kizel54tw6.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/BnicSia/73353970891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_b0ebeecd97074dbc8fb272aa9170df25.pdf?index=trueIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_882a7733c9704b4da6699cd5d41caacb.pdf?index=trueIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_c1be63b924ee4f12b968e38098526840.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_7e857da14c7b4f8a83939d126c4ecf0f.pdf?index=trueIn PDF document text
    • http://jewawemerawu.rf.gd/mininazo.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_ca389906fb29489a9fb4c0a86b8eddae.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_3df19704d0364fe2b3168898debc2bc9.pdf?index=trueIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_11701bc3bc124b21b8fc97baa5897a0e.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_2d8da3df0c334590bd31613fbfe9ceaf.pdf?index=trueIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_a95e1383e88c40aba0888a5f76fcadad.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_4cd9c71057d841aa93ee0b607eab2f6c.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_cc13ba5cab0542d59d1dde7c68c76c66.pdf?index=trueIn PDF document text
    • http://puvuxidaw.epizy.com/8933917463.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_2eb501d20b564849a14e1ca255e38e55.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_09c66e191af5479784aa2f255572bac1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B04 28784 bytes
SHA-256: 42139fdbd6369d70d86262a2b0118e3f57008ced4c686a00912aa5e1bc27d43f
font_01_sfnt_off00019538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19538 5688 bytes
SHA-256: c8b1ec4f4d27b3b37c8bdd544f38b1dfe263edf8daa584d763f2b13e4301db7c
font_02_sfnt_off0001a88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A88C 11568 bytes
SHA-256: 7171e888d9d80e70fe4c2e6dbf8c446fc6f349e79f44a6aae7d26edec1c723bf

Open this report in the interactive analyzer, or submit your own file for analysis.