Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1497885e42cbee7…

MALICIOUS

PDF

92.9 KB Created: 2021-03-29 05:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f25c570bcba247daa5717291223b0001 SHA-1: 5ab82dcc4b291dda99abf3f985caba1fca30e7df SHA-256: d1497885e42cbee78291f6f462264c392198d55c14e58d712be817fe37524960
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/award?keyword=adoption+papers+pdf+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5fe8218185a7b.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/aashto_lrfd_bridge_design_specifications_6th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_600fa89ee4ccc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5ffcf154e250e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_604a2bee42474.pdfIn PDF document text
    • http://tevfikyuce.xyz/84636453283vp8j1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_602940bf360b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5fe36669b9b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_601080e843f6a.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/723234396919ou4z.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/vuvokagidexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_a6ef18e02eb14b17b2bd706166de98c4.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_3643d26a231a40079b16c33672d98a9d.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_b408e6a629c94632ab228359772b7d59.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_5c034a3011f34553804daa3b4ae877be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b501192-7e8e-43c3-b245-f39b9be74376/black_and_decker_firestorm_18v_battery_a9277_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c64d56-52ca-495f-8d73-3ffe11c7231e/en_que_consiste_la_orientacion_en_educacion_fisica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd9aa30-9154-4106-ae70-011b8923a315/9318521214.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 5144 bytes
SHA-256: c55e793d790785046465712d467ccb543036407762cfc2edec7b5a2a099cb2b2
font_01_sfnt_off000128a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 11932 bytes
SHA-256: b372d5707f349bcebef647324b798222a662fed6ecce30d0d749125a44c4fd07
font_02_sfnt_off0001517d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517D 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c