Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca5146a8ab8aa1c…

MALICIOUS

PDF

75.3 KB Created: 2021-02-15 07:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7f5f2e78c861aa014cf122f537477675 SHA-1: 7f863fb180abdad5abb810669d20cda5b478b48b SHA-256: dca5146a8ab8aa1c1f7a9c8f387d1dcfc839f2d84ba18b07bf957bf587f07cf2
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://bologen.ru/aws?utm_term=innisfree+hyaluronic+acid+sheet+mask PDF link annotation
    • http://menazubuta.iblogger.org/93979109858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5feb042ee3e47.pdfIn PDF document text
    • http://vir-tus.com/business_studies_grade_12_study_guiden7zkf.pdfIn PDF document text
    • http://abanca-electronica.com/bukafojifigzie3f.pdfIn PDF document text
    • http://dalkomis.website/minecraft_pc_offline_modeoilgb.pdfIn PDF document text
    • http://jepekimeba.iblogger.org/avira_antivirus_security_android_deinstallieren.pdfIn PDF document text
    • http://laxeded.iblogger.org/wosubu.pdfIn PDF document text
    • http://baxemoge.iblogger.org/cessna_182q_poh.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
    • http://filexumif.epizy.com/19108876111.pdfIn PDF document text
    • http://gubimumowosa.rf.gd/pedokawam.pdfIn PDF document text
    • http://bemawom.rf.gd/aocs_official_method_ca_5a-_40.pdfIn PDF document text
    • http://geluzejezi.epizy.com/disney_beauty_and_the_beast_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/5227626507.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/rubiviralodoxifip.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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 5248 bytes
SHA-256: b4100737a66c7c52c68a9170b79d52a700bbcda39488c1f8a206cccdc88019bf
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 10460 bytes
SHA-256: 37cb60debe94bdb5dc1b8b83a8348c8791e559b1aac52aacd24db41aeb4d8cee
font_02_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c