Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a62c8a30539a756…

MALICIOUS

PDF

69.9 KB Created: 2021-01-12 10:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f670a67be812a49c6ca3ab56e1f66cec SHA-1: 9362e4149e9891f2221e4ae2c1f6b305bb4dd091 SHA-256: 7a62c8a30539a75605f96283b45d8e5e78f80c32cb77ba7f70696efef6e7e53f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points towards an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/aws?utm_term=sql+server+formatting+date%252F+time PDF link annotation
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/77429035c.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/OMgdGj0/all_stars_cricket_refund.pdfIn PDF document text
    • https://site-1176671.mozfiles.com/files/1176671/ping_pong_table_top_for_pool_table.pdfIn PDF document text
    • https://site-1176004.mozfiles.com/files/1176004/download_game_pepi_hospital_mod.pdfIn PDF document text
    • https://site-1180490.mozfiles.com/files/1180490/72910147124.pdfIn PDF document text
    • https://site-1178950.mozfiles.com/files/1178950/ar_effects_on_tiktok.pdfIn PDF document text
    • https://site-1174179.mozfiles.com/files/1174179/febogonozor.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/11566447235.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/sugaguxagu/86232255065.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/bosirabatuze.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/application_form_for_indian_passport.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/98592422184.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/54539197856.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/16555290411.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_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 5552 bytes
SHA-256: f6cbcba8830036ccf49f6a408f2c4cecdeb7595977b103e9f068d71bada5e0ad
font_01_sfnt_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 11324 bytes
SHA-256: bae5685e57d6802fe9b136bebbbb556848c8d3c1a0d3e30ed4ae471de87bcbfe

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