Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03d5b74c7e568bb…

MALICIOUS

PDF

66.1 KB Created: 2021-02-06 14:37:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2a738a322c6b151fec4cc5176f63bdca SHA-1: 24dca12d265b2cc144a3367ba239c34ec9c3a224 SHA-256: a03d5b74c7e568bbd7fd417c939bf9d40d18069504296ef8bab32b51ed9d25c7
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating it's part of a link farm, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'website development guide pdf'. No scripts were extracted, but the PDF structure itself facilitates the hosting of numerous external URLs.

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://maypoin.ru/aws?utm_term=website+development+guide+pdf PDF link annotation
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/nirodovi-zagozebipedal.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/jjif5gi/winking_lizard_macedonia_phone.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/fc2c141c6b8.pdfIn PDF document text
    • http://interplast.ru/systematic_biology_author_guidelines3782i.pdfIn PDF document text
    • http://odemebayisitrafik.com/my_little_pony_birthday_cake_singaporecvp3l.pdfIn PDF document text
    • http://reduslimitalia-official.site/cassia_angustifolia_medicinal_usesy91c2.pdfIn PDF document text
    • http://citruss.space/xugumukigiduzola126x8.pdfIn PDF document text
    • http://tublitalia.space/stiletto_nails_color_ideasj9qeb.pdfIn PDF document text
    • https://semizafug.weebly.com/uploads/1/3/1/8/131871859/roxavurokelixux_gakoka_pakeneto.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/ugigdhj/46787635461.pdfIn PDF document text
    • https://tugoxovelosiju.weebly.com/uploads/1/3/0/9/130969774/tojosuzazazalu-puraxikakasanis.pdfIn PDF document text
    • http://shoppermarket.online/archipelago_meaning_in_malayalamloif4.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/muvemasoxaji/badekafedajupunopufo.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/project_management_meeting_minutes_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/30488870277.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/abcesso_dentrio.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/81413201186.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/bookbinding_techniques.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_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 5268 bytes
SHA-256: 1176ab1c87c5ccbac3aadd66164964f61c741763545d578b795e5165420262fc
font_01_sfnt_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 10520 bytes
SHA-256: b4d266b76bfde0cba10d9a053ca3e45ed148a930cdd59a03bc479b0f1bca5e93

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