Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1187c4b31bb443…

MALICIOUS

PDF

75.4 KB Created: 2021-06-12 02:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6018c96199c17b03d413d1d107f702b1 SHA-1: 593ef8f97804933f9e2cfd268b48296acef196a9 SHA-256: 5d1187c4b31bb443eaef52c37bced5283cc41e587a636d1611f454ca61b09dd9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/pbw?utm_term=logic+pro+x+latest+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378382/normal_60486d7919e64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5ff64a25bf1e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_6054650cd2648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_60400ee778833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_6054ccd94aeb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9aa5c3d-d56e-4bb3-85ab-0c578d14afbe/juragig.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/a1_smart_watch_manual.pdfIn PDF document text
    • http://kevukimugo.pbworks.com/f/rigtone_new_all.pdfIn PDF document text
    • http://latojelu.pbworks.com/f/romijifokadapaxan.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/dapefavufuxogovebawabesuf.pdfIn PDF document text
    • http://fesatisobif.pbworks.com/w/file/fetch/144901668/m_letter_love_images_download.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/eastlink_cable_channel_listing.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/labcorp_electronic_chain_of_custody_form.pdfIn PDF document text
    • http://zanikofepaj.pbworks.com/w/file/fetch/144715044/pokemon_xy_all_episodes_in_hindi_dubbed_download.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144413598/hum_aapke_hain_kaun_mp3_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85547a48-ec5a-4329-abee-c50301e9428b/33165315592.pdfIn PDF document text
    • http://gozuwef.pbworks.com/f/jejidogawofez.pdfIn PDF document text
    • http://xuxorunewive.pbworks.com/f/watch_pride__prejudice_online_free.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/where_can_i_read_the_untamed_manga.pdfIn PDF document text
    • http://magobok.pbworks.com/w/file/fetch/144793998/what_times_table_is_127_in.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144683727/wetiwitafutanotukide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 5168 bytes
SHA-256: 24e6fec19a4e68d50f69ad1fbaac52f496a21cad7109e0b7bc3ece6bd879aed4
font_01_sfnt_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 10756 bytes
SHA-256: 0a4936fe3bbc1e140f8fb82aa4cff74d41ad15dbbc6a0dca794d5924f83b3e40

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