Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7483801598326e3…

MALICIOUS

PDF

75.0 KB Created: 2021-03-30 03:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 151246dec32f7dea77a87729cf603eee SHA-1: d08e460c2493a47eaee51db46b189596ee2847db SHA-256: e7483801598326e3f13d3f76cec5e81aece1c7ae27eceb3f9b55e7c7709f8297
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=nainital+tourist+guide+pdf
    • http://osmosiotzs.fun/comfort_sentry_thermostat_resetny82i.pdf
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5fc776febb70a.pdf
    • https://cdn.sqhk.co/wasefago/djajaic/calculus_textbook_thomas.pdf
    • https://cdn.sqhk.co/tuvasovosew/thiBGmd/textra_sms_apk.pdf
    • https://gusagipo.weebly.com/uploads/1/3/4/0/134017144/kumoxe.pdf
    • https://fonutupo.weebly.com/uploads/1/3/4/7/134727000/puregob.pdf
    • https://gogodelile.weebly.com/uploads/1/3/0/9/130969080/nibegesazumod_mejuferojilu.pdf
    • https://cdn.sqhk.co/nurijodefa/gegfSie/roxonalo.pdf
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5fd64f677a677.pdf
    • https://static.s123-cdn-static.com/uploads/4393220/normal_5ffd1babc7da6.pdf
    • https://cdn.sqhk.co/lexuxeza/gjn0hjx/3ds_max_overkill.pdf
    • http://foyou.store/wipelabiddvv8q.pdf
    • http://helpcenter.business/28207377244ge9oa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7e2f6a3b-b61c-4874-bbf3-93a2e59d2cc0/how_to_connect_ihome_bluetooth_speaker_ibt77.pdf
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_12815c28fd7f4988b3016c7af80e156b.pdf?index=true
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_715d0979c62e4382a2999ca615c221e8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1e201403-09fb-488e-8ddd-c8a65a7080b2/andrew_wommack_bible_commentary.pdf
    • https://uploads.strikinglycdn.com/files/f1407273-804a-4f62-ab89-26a9d061ff25/fifty_shades_of_freed_bahasa_indonesia_free_download_iphone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e5.bin
82333c305fc3a7f876edc1c91034ebf31da64e919918ca152c6144cf65c50392		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 5180 bytes
font_01_sfnt_off0000fa97.bin
1e45dc4b5bf5826d69e47ccff2c5d461b1bff0b5c2135eb692029cd5a548b3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 10728 bytes

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