Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b6cda1b19ad5ac…

MALICIOUS

PDF

64.4 KB Created: 2021-01-25 15:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9dab6ae767d62e69d3f4ca2f2f83ee7e SHA-1: e62a6abc3bf99def202e2db24d7ce9ba59a674dd SHA-256: 34b6cda1b19ad5acbd099a8d582bec2013d965648c6d380059c85f8cd23b965a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to other PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve to redirect users to malicious sites or download further payloads.

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/aws?utm_term=veterans+day+coloring+sheet+free+printable PDF link annotation
    • https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/6272696f1cc0.pdfIn PDF document text
    • http://pimuxiv.22web.org/chava_marathi_book_free.pdfIn PDF document text
    • https://cdn.sqhk.co/poturofivat/ibjhv6X/nuclear_war_simulation_by_defcon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5fc96be1f268e.pdfIn PDF document text
    • http://delojenopow.66ghz.com/vezinojuse.pdfIn PDF document text
    • https://cdn.sqhk.co/velizovatim/iegeJib/play_day_bump_and_go_bubble_dinosaur_instructions.pdfIn PDF document text
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/soputazokaxuxovis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_5fd107993e39a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454041/normal_5fdf12d693bd2.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/iblELjh/rumojivevokisojetetiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_5fda7ac9f1930.pdfIn PDF document text
    • https://cdn.sqhk.co/forokuxodel/RPZ9k4O/relarozezupane.pdfIn PDF document text
    • http://neroveruturom.iblogger.org/72972326259.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/NYhh0gi/pregnancy_simulator_game_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowipazivavi.epizy.com/aadukalam_720p_video_songs.pdfIn PDF document text
    • http://xubedoper.epizy.com/gubejozewak.pdfIn PDF document text
    • http://komewubot.epizy.com/70484557041.pdfIn PDF document text
    • http://dazimosanugep.epizy.com/listening_assessment_worksheets.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_off0000bea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA4 5624 bytes
SHA-256: 10b78179ced8126525ebfdafae2b9c8eb552e331e52d3612aa62c6338ce7ad5e
font_01_sfnt_off0000d1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C1 10172 bytes
SHA-256: dd256c24beeac698f6ab327ee8f434f58682f880828aca325be41ad9559920ac

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