Malicious PDF — malware analysis report

Static analysis result for SHA-256 6442320419c2a369…

MALICIOUS

PDF

72.1 KB Created: 2021-02-21 20:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f7ce6e828aa45396b5957ba4bb3d8e3 SHA-1: a0e085b53937ee41e3b88573da9f79e2cd7d615a SHA-256: 6442320419c2a369acf53ca6d1b52bc809cd385574d9f42c3dbdf394a7cdc545
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

The PDF file contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The 'SE_MFA_LURE' heuristic suggests the document is designed to harvest credentials or abuse multi-factor authentication. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://baarspo.ru/aws?utm_term=what+bodyweight+exercises+work+shoulders PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485935/normal_5fcd39258d3b4.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/jcZjbgg/magic_poser_1._50_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422659/normal_6008327dc31ac.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/0Jge8gg/duwefaxilarabuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5fcacab0a6f44.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/gurikosid_zizunapeperu_durivena.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/hjignGD/north_texas_rv_parks_campgrounds.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/gdhejit/life_simulator_3_wiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491412/normal_5fdecd8a8310a.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/jbGieo8/shape_monster_craft_template.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/AhafhgN/beer_pong_table_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/voduzetefir/dJnhhfY/professor_minerva_mcgonagall_quotes.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/resixexi/nenet.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/43971388615.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/platform_9_3_4_ticket_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/8761462520.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_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 5680 bytes
SHA-256: e3f39c2141e191df83d39652c2848374543f8af8be8af3a9fc9387dd84eacef1
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 10136 bytes
SHA-256: 0fff0c91e6871e2fd16de11cc53fa0adf1d418a7e92453b30d5b366a9ad7a6c3

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