Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d41f2c9448fa178…

MALICIOUS

PDF

77.0 KB Created: 2021-03-03 07:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 936d7ce4782a46a65f4e8ff41823d24b SHA-1: 736f4ca763a0d318d52612c34f1afecd6c554ff7 SHA-256: 3d41f2c9448fa1787898474f8e8400ad61d745799c50646aa139da3992ba7a84
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=is+skin+so+soft+good+for+mosquitoes PDF link annotation
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/padujegupopufe_gebodux.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/wipugutuwuwokan.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/jijchhO/weed_killer_safe_for_grass_canada.pdfIn PDF document text
    • https://jidakizunulub.weebly.com/uploads/1/3/1/3/131381167/naken-lumaxerujogere-timuxis.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/40703401948.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/ieghhdx/blue_bottle_fly_larvae_for_sale_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/xqibxM4/idle_world_mod_apk_ios.pdfIn PDF document text
    • https://womovenurobo.weebly.com/uploads/1/3/1/8/131872055/tunazagomawafuv_gewodejamip_musot_xarezikamok.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/9hhhhaB/tabletop_simulator_mods_folder.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/hj9jffZ/real_drift_car_racing_lite_apk_hile_indir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sezewu/chinar_english_12th.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/anorectal_malformation_slideshare.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/vavatopitixedubuxazel.pdfIn PDF document text
    • http://taguloxutenafol.myartsonline.com/directv_hr24-200_vs_hr24-500.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 4992 bytes
SHA-256: b9fd584b4f4d39e6c06bc7158f99b186202e9ab8d002ba8e84b272619dd9f7e8
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10688 bytes
SHA-256: 87397f0c5f7fe920b7ebd4015f5857e0d70a292c731a7ae143cb578251e6abc6
font_02_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.