Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c474ee1203ebc6…

MALICIOUS

PDF

79.9 KB Created: 2021-03-23 11:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8ec310e88233c6192aca258edc4e4d81 SHA-1: dbb53a6f7f26a9e6b71c612873e34da76c857d9f SHA-256: b9c474ee1203ebc6c270c2266fc69a8ca596c4f55b287f02fac2a7a2d7564e92
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL and the nature of the links point towards a phishing or SEO manipulation tactic, likely intended to direct users to malicious content or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/strik?utm_term=how+long+is+a+diversity+statement+for+law+school PDF link annotation
    • https://komupexe.weebly.com/uploads/1/3/4/4/134462920/37d9876.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/hjiecyd/85099670165.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/agdQjjP/live_tv_streaming_apps_for_android_box.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/p4yidii/solitaire_247_3_card.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/jgcvHhj/rt_nagar_news_today.pdfIn PDF document text
    • https://moxidoneke.weebly.com/uploads/1/3/5/9/135993461/podusuzisuze_domatorufalamol_silowiwiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/OihjgFj/3d_origami_patterns.pdfIn PDF document text
    • https://cdn.sqhk.co/donewipimep/U0yI2gj/bulumij.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/ijjidhb/witomewudosazanana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a8e47d3a-d7c6-4e66-8b22-c166320e78d1/how_to_set_timer_on_american_hunter_deer_feeder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa4bbf31-3143-4d23-a279-ce0c65eb2595/ronaguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ab2176-b7e4-45a2-af5e-bf0da04891ec/runotaradozaxibisuzexuwok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60db5826-558e-4c54-a916-42fff0af9bb9/sentence_level_reading_comprehension_worksheets.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_b640de9dc7824d4da98ad485e480b9ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7f8558-10d3-44fa-9fc4-9b4131ece2d0/xakisemukezuxidiligonoti.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_683e6938dc444961bf09b746dfb50eee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f14a28f-d791-4de7-9379-794ebe7c66eb/9902616339.pdfIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_55ce54870bf44ada98a01d4d2f85adbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc16e916-1a46-4b95-a356-a1b5b610228a/84832383508.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_c3a100c496d04adabeae4b6d461e6b1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/488c2113-9469-4751-97fd-56e2fc2c8c9b/jajafepinisiwidu.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_26d97333b5c44b24887ac7e321cc08d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ec78ee-26f3-4445-8cbf-4fe2ed8a11ed/xoluxaruwurilezob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad26b57-1640-451d-ab35-1d983df8a518/landscaping_ideas_for_the_side_of_my_house.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 5436 bytes
SHA-256: e7c9c31024d78ead00dfa98d5c2d8dc6fcff251c9280eba6546d872d7a266bf2
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10380 bytes
SHA-256: 8bc6b1d6d389413c8e447e261b04466a74221ffc70fad5f2b526dad8f1e60f27
font_02_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34