Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cb927d6ba2d4c3…

MALICIOUS

PDF

78.4 KB Created: 2021-04-14 19:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e4f0449150fd4dc264571ab89b28252b SHA-1: 7e62555616e1722f6522024faefb91be3a132eb2 SHA-256: 97cb927d6ba2d4c313e046008f2721456638a518f56b61eefd01830cdaa2a006
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+much+is+omnisphere+2.5 PDF link annotation
    • https://cdn.sqhk.co/lexebogefaj/icLpthj/capture_the_flag_unblocked_games_77.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/14a5e4cadeb.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/aGakmjj/rockauto_phone_number_for_returns.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/90190156390.pdfIn PDF document text
    • http://xegazufagabapo.22web.org/bapukemifupu.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/jfheBif/movekuvoganavewuvu.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/dagusibunanaxafilifalo.pdfIn PDF document text
    • https://jitogomufe.weebly.com/uploads/1/3/4/5/134588764/sukazawida_medipabogegili_butawumosalij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a443b15-8c47-407a-8d28-83747eebf884/how_to_connect_canon_powershot_elph_360_hs_to_iphone.pdfIn PDF document text
    • http://fujifumava.epizy.com/ronaxoxabesunes.pdfIn PDF document text
    • http://moniladipawi.epizy.com/partnership_deed_form_e.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/download_to_word_converter_arabic_support.pdfIn PDF document text
    • http://ravesezubepad.epizy.com/gas_clothes_dryer_reviews_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c34f23-35b0-400e-a037-11b067feb432/18464974426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a6ae8e-63f3-4f7b-adc5-76c294a238c9/37007273959.pdfIn PDF document text
    • http://zekibinixosa.epizy.com/3d_anatomy_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc422dc9-a0ca-470a-9da7-75bb8e0967fa/77520858589.pdfIn PDF document text
    • http://tovimowu.epizy.com/nuwasininipaz.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_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 5272 bytes
SHA-256: a1ebc43e64c549fc8fee78ea9d0b7d370f3ff6dec64f01c151dcecdfc43e2621
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 10916 bytes
SHA-256: b3d2fb03cf27ee80bfc479114ab49a871bd474c6fa17f840c59d111472116852

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