Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0f43168ada295c…

MALICIOUS

PDF

74.6 KB Created: 2021-01-06 03:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f60d4654ba289f3f2e1aee4ee041ac91 SHA-1: 73ee0b8bec980912f44f0122c45fd1d7ce406e4c SHA-256: dd0f43168ada295c757f181ca98fee0d46e5c426d5061a8bb7808ae774ce37f9
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm to other PDFs, suggests an attempt to redirect users to potentially harmful content or distribute further malware. The document body, though heavily obfuscated, contains references to 'Consumer report best car brands' and authoring information, which could be used as a lure.

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 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://trafffe.ru/aws?utm_term=consumer+report+best+car+brands PDF link annotation
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/2730803.pdfIn PDF document text
    • https://fowinojosusine.weebly.com/uploads/1/3/4/4/134495991/pokos.pdfIn PDF document text
    • https://tovoginimu.weebly.com/uploads/1/3/4/3/134379987/868fc36f4ec5867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473388/normal_5fa466f50017b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fca5e4abb346.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/5562670.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/bisegilupuf/xoleteg.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/platform_3_cafe_carnegie_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/44911147900.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/read_vampire_diaries_the_awakening.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/chelsea_boots_plateformes_2976_en_cuir.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/pajisorikiboderine.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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 2960 bytes
SHA-256: a31aedb3fe800cd2b5c0120397ec9570e12c7cc97febb81e3d6171160c50e6bc
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 5232 bytes
SHA-256: d51a72d09a7c3c9cd9f8d2e31220a1933e7cd259d2b5697025a4c45f07865f16
font_02_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 11224 bytes
SHA-256: f1bfa60aed8817c21c881bcc4825374d5bbb0a35491b15eb41e9860fd8681aa6

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