Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a7696878317e8f…

MALICIOUS

PDF

82.4 KB Created: 2021-05-02 01:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d6255d8d3da8404e4f17dbf8f1b71826 SHA-1: 46cd6c427109cb2144d94932dd6fc6bdf8e1baf5 SHA-256: 18a7696878317e8f8fa2b3b83da0a1610f8cdbb4bb3cf5fdd132985a361ec44e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://soxebez.ru/strik?utm_term=g+shock+5081+battery+change', are likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is designed to host and present these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://soxebez.ru/strik?utm_term=g+shock+5081+battery+change PDF link annotation
    • https://jamexujibelesuw.weebly.com/uploads/1/3/4/7/134748805/xolupe-letibeber-fujonevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_6018c11a6aed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_602b612cd7c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_60299f73edf2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_6066cd9fde902.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/67hhOje/vitamin_d_supplementation_guidelines.pdfIn PDF document text
    • https://kenawogerawe.weebly.com/uploads/1/3/4/5/134593039/90fdc8754.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/qheDia7/hyperspace_mountain_disneyland.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/Qghgjha/95070190849.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387054/normal_5fe3f12d08801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_5fd66a2e217b3.pdfIn PDF document text
    • https://gebiralegesexi.weebly.com/uploads/1/3/0/8/130814020/5404325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5fd147784adf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fe2264411bf1.pdfIn PDF document text
    • https://begiruxuvasepi.weebly.com/uploads/1/3/5/3/135351124/junosewexel-tezezitis.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/hj703cW/32647046026.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_6000d75b2506a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_f89622c8059740cfbe45a4f9600fdee7.pdf?index=trueIn PDF document text
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_b0abd01a3532475fa795ee51de73b5f0.pdf?index=trueIn PDF document text
    • http://vetiluxakosimut.epizy.com/lapasuvunubibadokaw.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/qualified_dividends_and_capital_gains_worksheet_2018.pdfIn PDF document text
    • http://wafitiw.epizy.com/lexapugojonu.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_f8b28a86202f4ac4bfdd9bb574a81956.pdf?index=trueIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_764048a1bb074ef1952f7e1befdd0012.pdf?index=trueIn 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_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 5876 bytes
SHA-256: b8882b920064244433fb42f1e512c309a80f90a6eec1f3919072ebbfe55d7547
font_01_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 13176 bytes
SHA-256: 0b1dc05622aa3d2be5686d4bf1b30cbf961f779f4a0b2542060ffc79ae449346