Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3eec19a2ecfb3a3…

MALICIOUS

PDF

99.5 KB Created: 2021-03-27 22:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c286524a6f8305415b77a2e22d14995 SHA-1: 83d2598c540d5269ce7dc44a9c4840360a264347 SHA-256: e3eec19a2ecfb3a3b35337432bdb6331cd7af97730a19c05b8e670c19ffacb1b
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 0.9979

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://xajibur.ru/aws?utm_term=nikon+d5200+launch+date PDF link annotation
    • http://sesulede.iblogger.org/biodegradation_of_crude_oil.pdfIn PDF document text
    • http://zipufofofize.22web.org/9994838305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_601bfa9ea8f1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_604317a481141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455884/normal_5fc96bca778da.pdfIn PDF document text
    • http://zeropium.com/niruwedasllzgl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_60371bead0e27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_6055251749136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479674/normal_5ffc16efb20a7.pdfIn PDF document text
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/supapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_6025f065abf45.pdfIn PDF document text
    • http://legalvictory.group/bebupipefigugv6zne.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/6490386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486042/normal_60476fab4e435.pdfIn PDF document text
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/bokubuwixozexo.pdfIn PDF document text
    • https://kudilasiwutoxe.weebly.com/uploads/1/3/5/3/135314551/lokobelewa_jifuzoxojuwulel_vebawuberi_sixapesugek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5ff952f5ebf5d.pdfIn PDF document text
    • https://ninapivojejuru.weebly.com/uploads/1/3/0/7/130775346/789b8912ba6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://tugojolowok.epizy.com/courage_brother_do_not_stumble.pdfIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_e235534188b642c683b2754e33c9eeb7.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_cf3d2aa200794507845b1bfdc6855975.pdf?index=trueIn PDF document text
    • http://laxuraxosolun.epizy.com/alien_shooter_1_full_version_pc.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_9fa870028d2b4566b960ded62bbe5140.pdf?index=trueIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_42c7c003255a4df89853a7625875d0dc.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_a2c9a08a715546988c6034a5da818a96.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 5184 bytes
SHA-256: 94a9a8a835212b310d274729cdf43760ac1c37b865a99ce6421726052389038a
font_01_sfnt_off00011d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2E 11760 bytes
SHA-256: 3d2327f9177a7113cc51f6a2f380c8cf551a3547adc84954f81af468bcd0f97c
font_02_sfnt_off00014508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14508 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_03_sfnt_off00015a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5E 12468 bytes
SHA-256: 94c53ea1ca215ad88e5da7571c3a1c4c062a040110a39b1a815cd026b5c23873