Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bb26930a948595…

MALICIOUS

PDF

74.9 KB Created: 2021-04-01 23:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7d6c852fda1859631c8dc11fee909295 SHA-1: 06083bb630ef4d14139d90337d65036e5f45721e SHA-256: 66bb26930a94859518dd16c5d4417a72f329d3df672bd47b5d1ba466fba327b9
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=cfisd+calendar+pdf PDF link annotation
    • https://cdn.sqhk.co/numavagoko/xMUJiia/ligib.pdfIn PDF document text
    • https://jomefibid.weebly.com/uploads/1/3/4/5/134596324/c9ceef6f9cbe367.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/7EGeihk/fidudo.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/jfAjfge/8146334219.pdfIn PDF document text
    • https://vuxupiwiruxip.weebly.com/uploads/1/3/0/9/130969000/eb6da3cf94d98f.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/9830801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_6000f5681ec3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_604d4a41b00dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_6026207f220af.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/geROSji/povufulovitudobax.pdfIn PDF document text
    • https://xevuradapo.weebly.com/uploads/1/3/3/9/133986258/2562a89f5ec8.pdfIn PDF document text
    • https://lijemokuw.weebly.com/uploads/1/3/4/8/134853622/zigopidasoro.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/geiehbP/iphone_x_lock_screen_wallpaper_download.pdfIn PDF document text
    • https://zotapuzuvekef.weebly.com/uploads/1/3/4/3/134323554/6528283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eab1941-a1a8-45fc-bcb4-d182c9dc30ca/go_ask_alice_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9958f99-0789-4d79-b73b-0474a48a1784/logo_design_apps_for_ipad_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/526bc180-1499-41b9-9809-11c6fd6fc20b/bebirolezimuvujekoweseru.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 5052 bytes
SHA-256: 58456d43354e30cfc02650156b42ea24c93e0d10d8eadb3a9c5f343bc9ab1430
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 10976 bytes
SHA-256: 890c551952cc99b8e1b65584402e29424520c974479a54c64b38700ae632840c

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