Malicious PDF — malware analysis report

Static analysis result for SHA-256 f601221ab6251c8d…

MALICIOUS

PDF

77.1 KB Created: 2021-03-11 21:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ce3272e6d65c3c0af406fd38356678dc SHA-1: ad7bd2a2aed7773f20996926197c8185385b6193 SHA-256: f601221ab6251c8ded893069b32f17c560131f01a5bb79a6a5bde7ddf3070a91
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://xezojetit.ru/wix?keyword=saved+by+the+bell+stevie+cast PDF link annotation
    • http://nowuweg.iblogger.org/how_to_fix_tv_main_board.pdfIn PDF document text
    • https://sekojufakov.weebly.com/uploads/1/3/0/7/130776719/180314.pdfIn PDF document text
    • https://dorulitonen.weebly.com/uploads/1/3/1/3/131380258/016949d.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/xotaxosuberugana.pdfIn PDF document text
    • http://zafimapi.22web.org/tizus.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/kadamiza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejulok.epizy.com/libopabiwikiv.pdfIn PDF document text
    • http://lurosanonit.epizy.com/why_is_my_netgear_router_not_working.pdfIn PDF document text
    • http://duxurulokij.epizy.com/irs_obamacare_tax_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/regadokenelowu.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/43599434650.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/92556884424.pdfIn PDF document text
    • http://mejesikiwabez.epizy.com/how_do_i_update_my_sound_drivers_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69182ed5-7a8e-4af1-b190-42f629fa3205/rilazu.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/arrowroot_biscuits_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/20021693875.pdfIn PDF document text
    • http://tuxusar.epizy.com/balalupuwituliwejaviw.pdfIn PDF document text
    • http://logupenevetisi.epizy.com/dupepuzimupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c421a23-bedf-4f49-b13a-ea1d81f7166d/machine_learning_books_for_beginners_quora.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_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 5336 bytes
SHA-256: 5e7f354bac20a520ecee69f97f8cafc62e56ba65aeb202dc15b3eedeca925ac7
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 10504 bytes
SHA-256: 75a867428ae48454d942c25df1f0f78357eb621ece6d5b015dde09496d5a6617

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