Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1c635a04b97d91…

MALICIOUS

PDF

82.2 KB Created: 2021-03-14 12:24:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f26dc96134a7b120d11460903c4bfe30 SHA-1: af46200d2f22ef363821b3ba2ddb1942611f16c7 SHA-256: aa1c635a04b97d91f3d90227efd8ee22945092509bad86a3367f84fa89a74195
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to example problems, which is likely a lure to attract users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=order+of+magnitude+example+problems PDF link annotation
    • https://waxagenejefud.weebly.com/uploads/1/3/4/7/134712445/tixedilu.pdfIn PDF document text
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/3874678.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/best_spoken_english_book_in_tamil.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/zebofisusejofavewetevu.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/allotropes_of_carbon_download.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/1e866dde12ab4dd.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/resolucion_1348_riesgo_electrico.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/19499683517.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/44df6.pdfIn PDF document text
    • http://ig-socialmedia.xyz/gesture_controlled_robot_using_accelerometer_project_reportx13ud.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/fonudesulo.pdfIn PDF document text
    • http://takipleskazan.org/birewilerapuvuloraga1gbua.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ropupifalapoges.atwebpages.com/zetipek.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/libro_de_educacin_fsica_bachillerato.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/gavatogijuk.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/74083997865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9873d184-84cc-4145-8ba5-5d774408ff4c/best_places_to_play_dd_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2d39ed-e244-4f54-ae2f-04ed616664ce/gaditikubodim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5829d80c-ff69-4330-9c53-de18d8cd75cf/30789176126.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_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 5596 bytes
SHA-256: c7f6a61ffc216205a10ec274ef87f3299eb51b7935c7ec3dbfb643243deb5514
font_01_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 12360 bytes
SHA-256: 6a3b9df0e4ce837b198f61b521580ded1640dce565ea32a89a2ecb8f584bedd3

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