Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c5e2efcf039158…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 15:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dccf8967efcbcf1480e6e99c15d4d58b SHA-1: e7236e35145de1b5303e9f05acf93377c603363b SHA-256: 99c5e2efcf039158e0209319094430ee5f361720dee3f29f0fb57da68633882b
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it may be a generated document used to host malicious links. The presence of numerous external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+to+replace+a+honda+civic+key+battery PDF link annotation
    • http://lobulezinovux.medianewsonline.com/sony_str_k840p_service_manual.pdfIn PDF document text
    • https://vakogiguwowokel.weebly.com/uploads/1/3/0/7/130775334/2f87155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_60384116837ce.pdfIn PDF document text
    • https://cdn.sqhk.co/mamozinuba/oUajiia/26024145001.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/669615e3c6.pdfIn PDF document text
    • http://businessmentality.com/botigigamasuto0uye.pdfIn PDF document text
    • http://tamakar.tech/how_much_money_can_i_make_streaming_on_twitch6wyzw.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/how_to_draw_anime_fast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_6028a4fd6fc2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_6023d217b5db4.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/jfgchaB/deuces_wild_multi-_hand_video_poker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_6033876048695.pdfIn PDF document text
    • http://dibiwarisogix.mygamesonline.org/the_squat_challenge_free.pdfIn PDF document text
    • http://titoto.xyz/tibumemopowufexejitoxie0bn.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/8807121.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/gX2jShd/fake_stories_to_tell_about_yourself.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/tatipi.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/Jdyhbjf/8384847419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_601bf955c5c0f.pdfIn PDF document text
    • http://meetplafond.xyz/definisi_patent_ductus_arteriosus9idpl.pdfIn PDF document text
    • http://makamar.xyz/top_free_world_ps4_gamesdho5s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 5404 bytes
SHA-256: bbe7b730ad2ea9f08bb1575373a9d7e6f7d2068af9914ec15e090bf3670401f4
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 10448 bytes
SHA-256: d44792e78fa4081a94ca120fa2ad97000c83b6626d71ec8f194315e9c1930ac3

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