Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe867f6374c9252…

MALICIOUS

PDF

80.9 KB Created: 2021-03-24 03:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e171708e41e8c1d56b3faadc920fdaee SHA-1: 9cac63bddc0776d834ff43eacaec04523f56a8bf SHA-256: 4fe867f6374c9252ce29a3e075cfb47546b2b64effac86f0d3ab2df208718e30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://fokemale.ru/wix?keyword=geometry+secondary+education+worksheet+1+answers PDF link annotation
    • http://wemepena.iblogger.org/quotations_from_chairman_mao_tse_tung.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_603081190f7da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_604bacca70c6d.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/foguwijevapozuruxis.pdfIn PDF document text
    • https://natugivekoxatan.weebly.com/uploads/1/3/1/3/131380011/0212358e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454809/normal_5ffa52a95f125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_603568e9eb66c.pdfIn PDF document text
    • https://xufipenisugiw.weebly.com/uploads/1/3/0/8/130873979/e01110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5fc7d5c234a89.pdfIn PDF document text
    • https://balexasureg.weebly.com/uploads/1/3/0/8/130874281/rumizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_601be1c3a9242.pdfIn PDF document text
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/8279554.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/what_is_the_authors_purpose_in_writing.pdfIn PDF document text
    • http://maxupalilapudot.rf.gd/sijibominesonav.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/58324467376.pdfIn PDF document text
    • http://ketaxesam.epizy.com/64673255963.pdfIn PDF document text
    • http://lorenivi.rf.gd/tijokeworotedolaw.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/bixolon_srp-_350plus_driver_for_windows_10.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_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 5488 bytes
SHA-256: dd6e0520bdf928d3bac8d5ef94adbc154a64bebb10119a977ec33e91afa816b7
font_01_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 11308 bytes
SHA-256: e0cfe750e6071815bbe6667e6901387bc9f4e1120f9d18bc74fcc7d485ae0963