Malicious PDF — malware analysis report

Static analysis result for SHA-256 955b7233d33dbfe8…

MALICIOUS

PDF

85.3 KB Created: 2021-02-23 11:31:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 049402f2df3119174fc456fa73ef3423 SHA-1: 359ec66d1ec453b3ac194d8cc7d3eddbd1b052bf SHA-256: 955b7233d33dbfe8b9ce1a55ee51f01055dc26c604430042ebac807facdc7949
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The presence of 'utm_term' parameters in URLs points towards tracking and potentially malicious redirection schemes.

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://jottigo.ru/aws?utm_term=college+board+sat+book+2021 PDF link annotation
    • https://cdn.sqhk.co/rotexopapi/fjeNAgf/72249405126.pdfIn PDF document text
    • http://goguduve.iblogger.org/fairfax_county_circuit_court_civil_cover_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/Vsihmgh/zuduxurizaluje.pdfIn PDF document text
    • http://realnoe-obshenie.online/primary_2_mathematics_questions_and_answersq1io6.pdfIn PDF document text
    • https://ropedali.weebly.com/uploads/1/3/0/9/130969406/gazuvisobukisij.pdfIn PDF document text
    • http://9gusevshop.website/popular_country_music_artists_2020zaqns.pdfIn PDF document text
    • https://cdn.sqhk.co/duburijudi/0uDEPXk/digestive_biscuits_target.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412394/normal_5fed4ffab8894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372740/normal_6000d90531f2a.pdfIn PDF document text
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/368e2a78c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5fd1232b2f50a.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/LBBhbhc/24786388645.pdfIn PDF document text
    • https://zagavodemutiza.weebly.com/uploads/1/3/0/8/130814258/1769657.pdfIn PDF document text
    • http://particulieres-societegenerale.best/gujajosusexibomopegisazopwew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiwisi/code_promo_get_your_guide_prague.pdfIn PDF document text
    • http://pejefovad.epizy.com/transformar_de_binario_a_decimal_online.pdfIn PDF document text
    • http://sozizuw.rf.gd/inuit_metis_food_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/wiseruw.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/bcdboot_windows_10.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_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 5428 bytes
SHA-256: 435ea8583cc64a51d717bf87429ad2231dc9946dfa445cc11a0ce583f17b82e6
font_01_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 10668 bytes
SHA-256: 9b976e50b6f49850a2163e4c2a151eeb29001e5f8fec700487befb2902b8c39e

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