Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ace95e13e36df2…

MALICIOUS

PDF

79.9 KB Created: 2021-03-29 03:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b21145db28042644e0a7be41aaca240d SHA-1: d4ae0914fd7e752980458e54b8d4ec21179b72ad SHA-256: 66ace95e13e36df2fa0f27f104b165e90ac80f77ddddd26310063ba0fcf5f15b
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to potentially malicious domains, suggesting a link farm or phishing lure. The PDF's structure and embedded content, while obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=witness+statement+example+for+work
    • http://thesimplycompleteseries.com/partition_piano_julien_dor_sublime_et_silencel2hml.pdf
    • https://livekojumezo.weebly.com/uploads/1/3/4/3/134384671/5118398.pdf
    • https://cdn.sqhk.co/wejafivelij/jbhgEdS/97243891185.pdf
    • https://cdn.sqhk.co/viwedanej/biaMgS6/62933503370.pdf
    • http://drenajkrasnodar.ru/22628577222lj3yh.pdf
    • https://rigagebefizo.weebly.com/uploads/1/3/4/6/134631069/9341453.pdf
    • http://vigastlens.xyz/sizazyti1p.pdf
    • https://cdn.sqhk.co/nupumusu/rSIKIic/earth_preschool_craft.pdf
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/newanataroved-wobodo.pdf
    • https://cdn.sqhk.co/tisufupujeli/cidAxbk/14900374945.pdf
    • http://presentinsta.site/stephen_king_movies_best_horrortgy49.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dekogamik/free_html_web_templates_business.pdf
    • https://uploads.strikinglycdn.com/files/9b06bdd7-bc6f-4a8b-8eea-ff5aa23c7d92/paint_by_numbers_canvas_adults.pdf
    • https://uploads.strikinglycdn.com/files/35c1ec05-5bb0-4f3e-80d3-89cc6627574b/is_ps_vita_worth_buying_in_2020.pdf
    • https://s3.amazonaws.com/bejenosugede/wasopazimesorewajisup.pdf
    • https://s3.amazonaws.com/viromibukoleliw/73309823056.pdf
    • https://s3.amazonaws.com/libusamagowuvo/93410889960.pdf
    • https://s3.amazonaws.com/jobavo/8633552633.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f005.bin
c7da42cbe7afe2804a1b06d6ed07d5cd8edeb678355bea6838308970cc7c4b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 5072 bytes
font_01_sfnt_off0001013f.bin
17130b1a1400917a9fedda620546b2d7f4c0e823ff4dda9dfe0c9a40c7fde8ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 10368 bytes
font_02_sfnt_off0001244d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 4324 bytes

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