Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c8830ff83b977a…

MALICIOUS

PDF

79.5 KB Created: 2021-02-17 05:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3517a3c21c5dd428e46aacc0f8360901 SHA-1: b5329e22ffa91ddf2319d13544685fb39313f9b4 SHA-256: 43c8830ff83b977a29116182d791065b8307da6e991b2f0967e5732f947f1ce9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=the+sight+david+clement-davies+pdf PDF link annotation
    • https://cdn.sqhk.co/xitilesuxiw/iidI2gf/start_em_sit_em_defenses_week_5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fe40f92b04cd.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/jdgdibt/regipugenajukaforigetede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404497/normal_5fdfa859854e4.pdfIn PDF document text
    • https://sakobapo.weebly.com/uploads/1/3/3/9/133999770/vexufitimumuwatamu.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/xubizoxibor-mafajasijekeri-polumasurod.pdfIn PDF document text
    • https://cdn.sqhk.co/dobexesi/iiZgdPt/17368329741.pdfIn PDF document text
    • https://simidolipuxemit.weebly.com/uploads/1/3/4/4/134486986/1892862.pdfIn PDF document text
    • http://samejeno.iblogger.org/kelawegoluvefatemomojubu.pdfIn PDF document text
    • https://zitupakunetod.weebly.com/uploads/1/3/0/7/130739751/8611882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fefa13828c36.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/j3ngjjj/find_my_friends_iphone_app_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5fe6ec0802cef.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/4305900.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/Dijjasg/assistant_project_manager_salary_los_angeles.pdfIn PDF document text
    • https://vogexuweju.weebly.com/uploads/1/3/0/9/130969932/vusupedule-bosumurovifib-tezuwefadofadiw-kukupo.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://kubemumibesedu.epizy.com/10163078315.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 5192 bytes
SHA-256: 6dcaf785fb97b2fc740a7f27010316e1663a174f9c10e794cd9f475c076e06a6
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 10312 bytes
SHA-256: 35b0d30895d8ef7509e7188888a46952cf6cef2c8b7fda56649c1e4e9cacc534
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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