Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ce5160306130c2…

MALICIOUS

PDF

73.5 KB Created: 2021-03-03 03:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6bd80ed1cd2ad9d8a80706588fa61161 SHA-1: 0819cca8e94ce447b5cc9cc7f94353821e1e65ae SHA-256: c2ce5160306130c2d622d4776c730cd97b167e79b811d5af9740674a0b280bfb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Fly tying kit' and 'wkhtmltopdf', which are likely lures to disguise the malicious nature of the links.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/123?utm_term=fly+tying+kit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451945/normal_6039ed33e805f.pdfIn PDF document text
    • http://reduslim-officialsite.site/23930132639qtlyi.pdfIn PDF document text
    • http://sethel.xyz/566453689830771t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446400/normal_5fc6c9a050e95.pdfIn PDF document text
    • https://wurivebufe.weebly.com/uploads/1/3/0/8/130874680/lurifilet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6023d1d1eb1a9.pdfIn PDF document text
    • http://xitnet.fun/list_of_mathematical_constantspdpzs.pdfIn PDF document text
    • http://lokotahas.ru/what_does_godchild_mean_in_spanish976q6.pdfIn PDF document text
    • https://cdn.sqhk.co/vakujediraw/5zXhcih/xbox_one_x_pre_order_best_buy.pdfIn PDF document text
    • http://weraka.online/45742246793dr2vt.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/fTjjhbF/flip_dunk_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377912/normal_5fdfd51d631a3.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/HwigjaG/meaning_of_toggle_switch_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_5fca41d3f1975.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 4492 bytes
SHA-256: 29c25e8b28a8b31b10e82404b7d6e26b3ada10af1bdbf3f98ae9fa657eaa3690
font_01_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 9880 bytes
SHA-256: 9f2c141d507e013f1ec5a8223e31b6745a9df78ab71a7d14db45a36bc2a53153

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