Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ceedcacaac8b213…

MALICIOUS

PDF

79.9 KB Created: 2021-02-16 21:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: af2ef17d7a43b354821a19695e60b737 SHA-1: 28eab2fc39c9f22fb428f9265a5fedec3edcf409 SHA-256: 1ceedcacaac8b213a930a95fd0b982ec942a0c9cd0ca283ce03f3b2e773653d0
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/123?utm_term=how+to+replace+brother+toner+cartridge+tn660', suggest a phishing or scam attempt. The document body, though heavily obfuscated, contains metadata related to PDF creation, reinforcing the file type.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=how+to+replace+brother+toner+cartridge+tn660 In PDF document text
    • https://cdn.sqhk.co/wawabosamugo/hcxEDic/murder_mystery_2_wiki.pdfIn PDF document text
    • http://emirofficialzm.com/speed_distance_time_worksheet_ks3kpfjp.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/xiwegupofojasa-ziwewof-vorevana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_6026e2c8b3832.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/kovudibumus_bulujanelosori_riwibabuk_mojakotupow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446026/normal_5fee3f45e2c92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fde4e30e032d.pdfIn PDF document text
    • http://vorecan.space/99386058128cqh32.pdfIn PDF document text
    • https://kaxufuramizoval.weebly.com/uploads/1/3/5/3/135387701/b582b831.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/adjectives_list_with_meaningsvks4y.pdfIn PDF document text
    • http://topcabinets.xyz/worksheet_1a_body_systems_and_structureslkj5b.pdfIn PDF document text
    • http://nigma24invest.online/meditech_charting_cheat_sheetv07l3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xezemiguve.rf.gd/vilewoxatupatis.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/sufezajifupofikudejike.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/video_kartun_lucu_terbaru.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_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 5436 bytes
SHA-256: 5cde5403f077f4f09ea4b1fb5c32174b73b73d4b8094b2be54aae8d4fd1308dc
font_01_sfnt_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 10524 bytes
SHA-256: 2092ace583de9ff2329dc455315b9e6ddf7ed0d5070be312f7a93d314ed0c8a0
font_02_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_03_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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