Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8faa3a54d5f8ee…

MALICIOUS

PDF

71.6 KB Created: 2021-02-12 21:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a17e7be6c3612637f71c7db06a86b5fc SHA-1: 96c59a6c7eeaaf4136dcc85056618fe69a832273 SHA-256: bd8faa3a54d5f8ee91462efa3a1e99bbe2a787a59d5a11d8a241371bf585a92d
226 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a password-protected-archive lure. 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 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=yugioh+pro+android+2018+apk PDF link annotation
    • https://cdn.sqhk.co/jedepazisu/gt3tifQ/ups_drop_off_gonzales_ca.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/6fe48cceb9.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/0hggha6/republique_dominicaine_covid-_19.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/vuxekamepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_602298c2df83c.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/wifazawugesurim.pdfIn PDF document text
    • https://tifixexeruwa.weebly.com/uploads/1/3/2/6/132682204/4488001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_600d64e174112.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/wilunemamajogob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454168/normal_5febee11a8f1e.pdfIn PDF document text
    • https://musazejat.weebly.com/uploads/1/3/1/1/131164110/xedipeforiwanixoret.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/aswR3id/mujagowurozitaputefude.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/GhdNi13/30927409325.pdfIn PDF document text
    • https://cdn.sqhk.co/defegitip/gfnjige/55925232597.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/jfghhdq/3d_skull_atlas_for_pc_download.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/wasojepu_muburunigata_daravojineba.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/Zibevib/82523724706.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 5556 bytes
SHA-256: dc8c02ac7edb756c19e6c3f9d584cec1b2c33e842c8078d589ce40d004e05852
font_01_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 10504 bytes
SHA-256: ecd534ff67a2f1534ef56ed1c3f153e0d6c7bb2a8e2dd0bc739a5fa985c1016a

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