Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9fe2f5f46d8ae7…

MALICIOUS

PDF

75.7 KB Created: 2021-03-29 08:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 73c8c2d6355497af863e212c16c378f9 SHA-1: 72230cc8110ae148c56c295f5d0280705b11fb13 SHA-256: 9f9fe2f5f46d8ae76be661aeeed7e2c71024be873f085becafbc826c344a3f9a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dugedepap.ru/123?utm_term=boiler+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408873/normal_5fd0eca4aedc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_601923738c48e.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/21642438528.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzikago/jbbjcux/33780907340.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzozuni/RbNdhgP/rank_and_file_definition_military.pdfIn PDF document text
    • http://nicechange.space/doing_ethics_4th_edition8206y.pdfIn PDF document text
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/c201f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5fc811aea60c0.pdfIn PDF document text
    • http://maturibcgj.space/bts_danger_song_mp42bzai.pdfIn PDF document text
    • http://espacecmb.xyz/27147800074brwq3.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/kefisa.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/jagfnPY/99644186561.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/bjaijxm/lazada_touch_n_go_ewallet_refund.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/dibrugarh_university_bsc_botany_syllabus_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365570/normal_5ff881e0225e3.pdfIn PDF document text
    • https://cdn.sqhk.co/sinonari/blwKLgd/tower_heroes_wiki_spectre.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/tirolubisu.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/java_jdk_win_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/culture_of_honor_danny_silk.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/android_module_types.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/how_to_reset_braun_thermoscan.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_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 5056 bytes
SHA-256: f7d2474714a3bdb026b763dbf5433e85d364daabb2feed3506334d1ee19dc9bb
font_01_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 11116 bytes
SHA-256: 54bcdd759d0ead48ce38c4a30a30e1aa5f5e07c13cdfc6cccf880892297b59ff

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