Malicious PDF — malware analysis report

Static analysis result for SHA-256 866318d8b86c4c80…

MALICIOUS

PDF

70.2 KB Created: 2021-01-18 00:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: eb2a8d11bac11192644b3c479412ea3a SHA-1: c86be3ad1017f18a02f7c30d51f6a52e2cf79b31 SHA-256: 866318d8b86c4c80deeb4267f351417d69284e63ed9e0ca4420943396e15d834
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'trafftec.ru', suggesting it's used as a lure to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=algebra+1b+answers PDF link annotation
    • https://site-1173589.mozfiles.com/files/1173589/medepoma.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/ruwirenuwibapoja.pdfIn PDF document text
    • https://site-1168118.mozfiles.com/files/1168118/lyca_mobile_recharge_stores_near_me.pdfIn PDF document text
    • https://site-1239248.mozfiles.com/files/1239248/woropatogono.pdfIn PDF document text
    • https://site-1168117.mozfiles.com/files/1168117/80870630887.pdfIn PDF document text
    • https://site-1199467.mozfiles.com/files/1199467/consumer_reports_washer_dryer_combo_2019.pdfIn PDF document text
    • https://site-1179337.mozfiles.com/files/1179337/star_wars_retro_collection_target_dpci.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5f941ed528fe7.pdfIn PDF document text
    • https://site-1178004.mozfiles.com/files/1178004/vazenojifatidizapiluwasal.pdfIn PDF document text
    • https://site-1178471.mozfiles.com/files/1178471/2390744310.pdfIn PDF document text
    • https://site-1166595.mozfiles.com/files/1166595/nelirafivun.pdfIn PDF document text
    • https://site-1244582.mozfiles.com/files/1244582/english_alphabets_in_different_styles_free.pdfIn PDF document text
    • https://site-1188839.mozfiles.com/files/1188839/woodturning_supplies_yorkshire.pdfIn PDF document text
    • https://site-1174026.mozfiles.com/files/1174026/24468694109.pdfIn PDF document text
    • https://site-1180277.mozfiles.com/files/1180277/86483897530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_5fdb08f7a18ef.pdfIn PDF document text
    • https://jodaxirijiv.weebly.com/uploads/1/3/0/7/130776114/tivimizetajinozaluse.pdfIn PDF document text
    • https://site-1176160.mozfiles.com/files/1176160/jubawetaxotogufa.pdfIn PDF document text
    • https://site-1168006.mozfiles.com/files/1168006/world_war_3_movies_on_netflix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f9394ec6ddd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447465/normal_5fdef2d1501f1.pdfIn PDF document text
    • https://site-1174929.mozfiles.com/files/1174929/xefaxup.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_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 5128 bytes
SHA-256: 5ed7eec5fafa9acd55d8a06cd95ce82f98fc28982470c041e433f0cc1f7672e1
font_01_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 10100 bytes
SHA-256: bad1a9143652762ef5c2d31b7590f28b10ff647b4d55d256d2db84ad0d717b7f