Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18554b15498a9fb…

MALICIOUS

PDF

73.0 KB Created: 2021-02-15 05:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d92411318e2285fa53d18a24fc32ef90 SHA-1: daf77f75b9222c6c4a32661f36b35d8e7d3d4082 SHA-256: d18554b15498a9fbba1a73f0ef6ca10b64e80a92b64a7290edd7e6543a75c95b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a large number of external PDF links, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to a product manual, likely intended to mask the malicious redirection to URLs such as http://btsworld.org/vewamijijalaginawamusesr6j3.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/wix?keyword=spectra+s1+breast+pump+manual+pdf
    • http://btsworld.org/vewamijijalaginawamusesr6j3.pdf
    • https://cdn.sqhk.co/fakodozug/icggqgg/58007043967.pdf
    • https://cdn-cms.f-static.net/uploads/4465919/normal_601921d2bf4ad.pdf
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5feb80ac6e03f.pdf
    • https://cdn.sqhk.co/dawajimet/VY0YVLJ/drive_ahead_sports_mod_apk_android_1.pdf
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5fdce9cca29ad.pdf
    • https://nifazupu.weebly.com/uploads/1/3/4/5/134507595/6582298.pdf
    • https://static.s123-cdn-static.com/uploads/4487888/normal_5fdf92e04d4ed.pdf
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/3747287.pdf
    • https://cdn-cms.f-static.net/uploads/4393752/normal_60228425af615.pdf
    • https://cdn.sqhk.co/noruwotil/hjhiVhc/at_t_digital_life_security_system_reviews.pdf
    • http://lnstagram-blue-badge-form.com/dujikmc7ec.pdf
    • https://pobolibawawo.weebly.com/uploads/1/3/1/4/131437087/soxaperosoxenoxujuv.pdf
    • http://electriccannoz.club/fate_grand_order_saint_quartz_genera5lp7k.pdf
    • https://wikusujuvi.weebly.com/uploads/1/3/1/4/131406665/4555808.pdf
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/runaji.pdf
    • https://static.s123-cdn-static.com/uploads/4407997/normal_5fe223849ddbb.pdf
    • https://static.s123-cdn-static.com/uploads/4476946/normal_5ff6295be300d.pdf
    • https://bozalofagolukor.weebly.com/uploads/1/3/0/9/130969011/897185.pdf
    • http://akillidestekbasvuruformu.online/digi_easy_planpumbe.pdf
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/4360990.pdf
    • http://prolac.ru/easy_riddles_in_spanish_with_answerswho55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00f.bin
520a07a500d09b8d1da61e7c77beefe87ede998a8d0d57c03d85f0c1c58bf032		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 5596 bytes
font_01_sfnt_off0000f2ff.bin
6bcb82955ae3c453ff461422e2b29bc690e18776516af17d19947a21ac207e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 10324 bytes

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