Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ab320b3b339ef3…

MALICIOUS

PDF

74.5 KB Created: 2021-03-20 13:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8fa8b3f8568fe10d6d02d8352a5360d9 SHA-1: 67df0e53d159084bdb8acfc9b781d208473b13aa SHA-256: 64ab320b3b339ef380ce66c16e2b1d390edfdd3097296e7a9f3a108430da13f6
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=what+would+you+like+to+eat+in+mandarin PDF link annotation
    • http://kajuzumanaz.sportsontheweb.net/14339736517.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/dlink_2750u_v1_firmware_india.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nugafafekovad.epizy.com/zerixewasi.pdfIn PDF document text
    • http://jujobope.atwebpages.com/marketing_strategy_definition_by_authors.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_28b95d0fc01d4774a32b5bfb34474ff5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8de0b9-fce7-4b8d-97b5-5f429009fca5/sunbeam_cool_mist_humidifier_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/features_of_ms_excel_2007_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84f8fe0-8a3e-4fca-a6d9-78fa78fac54e/xukeloludabidaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319b457d-17ed-425d-b6fd-c0747764599c/asus_t100ta-b1-gr_screen_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/members_mark_pellet_smoker_grill_parts.pdfIn PDF document text
    • http://vuzujalaj.epizy.com/nidivozefot.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/gagonerimudazefiwixu.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_4aa8014eaf3549939e4f3cd4b7582826.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15efab7-d3ca-41f0-911b-62f99f4249f9/kizusilarawoxumavijo.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/gimarowokasotexegudofit.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_aefacf684b494a9f9843d7f0f9d48195.pdf?index=trueIn 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_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 5156 bytes
SHA-256: a8c6ee433e8e56137cc388012aef4253ce6ce98c4c87f11a27326d5dad88ff2a
font_01_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 10136 bytes
SHA-256: eb92ba89682b41b24c1f2fb54f25fb7b6a39bb76ec92ea533fd65df1231715e0

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