Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f42d91ae5631114…

MALICIOUS

PDF

82.9 KB Created: 2021-02-09 10:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b1be32ce6780e2fc1f2cb859b753d3a SHA-1: 5f2d6cb3387dbff5568301ba62578cbeee4fa70a SHA-256: 1f42d91ae56311140fd785a7b45dedb89edb9f559e367b077f628bc307fcbbf2
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 point to other PDF files, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://seumenha.ru/aws?utm_term=animation+photo+editor+app+for+android', likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/aws?utm_term=animation+photo+editor+app+for+android PDF link annotation
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/wobajimilibobijup.pdfIn PDF document text
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/lapovixozejefavexiw.pdfIn PDF document text
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/safevojekos.pdfIn PDF document text
    • https://jalizirut.weebly.com/uploads/1/3/5/3/135308553/viwuwovi-gevos-wurokeganuloke.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/jjkwcFm/tereralobibu.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/lijligd/empire_z_endless_war_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sugosabogakeg.rf.gd/83781941547.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/wopixu.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/tonetifatewibegazuvito.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/wenusula.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/calculus_first_course.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/rom_boogerman_snes.pdfIn PDF document text
    • http://puzasapexuwuju.epizy.com/miss_universe_question_and_answer_funny.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/chrome_adobe_flash_plugin.pdfIn PDF document text
    • http://xamudakosenezi.rf.gd/lanewuxaba.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/josozabone.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 5060 bytes
SHA-256: 17b259a3da72927d7b4e8fd4d3c6c1594155b5b1d11fa27080a14716bac3da85
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 2244 bytes
SHA-256: 8a254c6a66a515b43a4659fde0a8ed8e4f54f18453b93c6e15797b6a583bb199
font_02_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 10596 bytes
SHA-256: 21605bb236f908d3423d6648c4041faea384c203d6f0d44a644a3b3b9f8d0140
font_03_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 16352 bytes
SHA-256: d5c1d73facc1ee30369663d5bc9e1d56b1b6bad2d1eb0652642bc5daa7bdf87b

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