Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc0147715811c02…

MALICIOUS

PDF

83.6 KB Created: 2021-03-02 23:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: abedca729872565b784f569a97f4bd84 SHA-1: b55c13e4cf19a1d3bdd5a5f59c8d3c3621292f10 SHA-256: 8cc0147715811c02048390fbbe96a5b972b2fde365b5e9a39e104da6f6853867
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, indicates a lure related to 'Socratic seminar worksheet 4th grade'. No scripts were extracted, but the presence of multiple external URIs and the overall heuristic profile strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://kuzutuzo.ru/wix?keyword=socratic+seminar+worksheet+4th+grade PDF link annotation
    • https://vevuduwas.weebly.com/uploads/1/3/0/7/130775740/vapolinerodudid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_6006c603839ce.pdfIn PDF document text
    • https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/zulofepekak-bajilataw-gabijovopilo-noritexiwakek.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/5357998.pdfIn PDF document text
    • http://lunesygets.xyz/ata_chapter_27tmc2p.pdfIn PDF document text
    • http://1cats.space/mobile_charger_circuit_diagrame7in4.pdfIn PDF document text
    • https://zorutamazu.weebly.com/uploads/1/3/4/0/134096431/gubibejame-xafewavej-xusuxo.pdfIn PDF document text
    • http://crubr.space/how_to_start_a_letter_of_recommendation_for_someone23gll.pdfIn PDF document text
    • http://bupiwasun.iblogger.org/luloparagaxabawaw.pdfIn PDF document text
    • http://gowumexagap.22web.org/what_is_sword_art_online_progressive_all_about.pdfIn PDF document text
    • http://biggymstoe.com/nesajokazifiponirijolo6a4as.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vepuguda.rf.gd/best_dash_cameras_for_cars_consumer_reports.pdfIn PDF document text
    • http://fomonew.rf.gd/38013286193.pdfIn PDF document text
    • http://zejowupifodoj.rf.gd/suwebaxunanor.pdfIn PDF document text
    • http://mesuwirafifi.rf.gd/nonuxofomokuzim.pdfIn PDF document text
    • http://zetamox.epizy.com/keto_daily_intake_guide.pdfIn PDF document text
    • http://ralokavuxubu.epizy.com/52907234642.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_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 5668 bytes
SHA-256: 05c33ad559eafc3416cfa883b57fe3bc9b63695eb98ce083cb6a2841a12acadd
font_01_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 10388 bytes
SHA-256: d13fbca0010286481edd5aaf7e6d1453e9684dd74079264559d16dd372be01b6

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