Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ce91eab679fcdb…

MALICIOUS

PDF

86.7 KB Created: 2021-03-19 12:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfff2fbe454feff012dd44db5cae6593 SHA-1: de897da1738d2a5fb286896ec1544cc97594d39b SHA-256: b6ce91eab679fcdb3a5a5d3d59089d1eee2f55b664a84c7b3f5dda3ba80f0498
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm attacks or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=how+to+value+a+bookkeeping+business
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/jisenamixutidov_fukiwugetafuti_kujiwone_girikapidojo.pdf
    • http://wupidubame.mywebcommunity.org/artikel_bahaya_rokok.pdf
    • http://gukabibus.mygamesonline.org/93804566069.pdf
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/1887179.pdf
    • https://cdn.sqhk.co/zamokaxu/RPhhsii/clover_dating_app_snapchat_ad_girl_name.pdf
    • https://cdn.sqhk.co/bolukawet/Gjbgdjb/87324351101.pdf
    • https://zidifupo.weebly.com/uploads/1/3/4/4/134475425/xaruvurege.pdf
    • https://riderasal.weebly.com/uploads/1/3/0/7/130738784/muvegole_kuwarekopotu_dujavarunibepen.pdf
    • https://cdn.sqhk.co/sesedazaw/thjLhib/report_card_comments_for_speaking_skills_esl.pdf
    • https://kelebididoxo.weebly.com/uploads/1/3/2/6/132681806/tulad-mobaduv-ladepakaf.pdf
    • http://sutovuresas.mygamesonline.org/75426677994.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/57efa289-655c-4f8d-9430-43589e271f38/kitchenaid_superba_ice_maker_not_making_ice.pdf
    • https://s3.amazonaws.com/xixonu/meregemogenasib.pdf
    • https://s3.amazonaws.com/ritoma/40429029819.pdf
    • https://s3.amazonaws.com/zoromexemuzid/cbse_guide_class_6_maths.pdf
    • https://s3.amazonaws.com/kabisebax/mifebalej.pdf
    • https://s3.amazonaws.com/liguwubore/sure_fire_forex_hedging_strategy.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/textsorten_informative_texte.pdf
    • https://uploads.strikinglycdn.com/files/928cc6f9-aa2c-4469-8bcd-9f1cad837647/bad_case_of_stripes_cause_and_effect.pdf
    • https://s3.amazonaws.com/zufojadibi/vozelevugunekarufatuw.pdf
    • https://s3.amazonaws.com/risisipajole/tietz_clinical_chemistry_textbook_free.pdf
    • http://nupuzawov.onlinewebshop.net/zopikoz.pdf
    • https://uploads.strikinglycdn.com/files/3a7f8848-879b-45f0-bedc-9f4e2b2d14a6/16776907081.pdf
    • http://zirutabu.myartsonline.com/poliwirevoxar.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_off0001144a.bin
f4762028e8c8f33fed34d4b71ceb608ffdbbc216c38b0e9e4280e36f34d44751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 5208 bytes
font_01_sfnt_off0001262b.bin
10f65dde3513046309735ee2f24f4d50896d37f82307dd8c3c9728e21da1ee83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 11408 bytes

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