Malicious PDF — malware analysis report

Static analysis result for SHA-256 28abe5fe4cdb928e…

MALICIOUS

PDF

73.9 KB Created: 2021-03-18 07:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b21ace9e159a00dcf9966620cdf7a8b1 SHA-1: 7bb3c884c76411b0704d8e44ee0ec7c42e55a594 SHA-256: 28abe5fe4cdb928eb552a84d8698a267f7e410886546f5515032895920330cdb
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The document body, though heavily obfuscated, suggests a lure related to 'exam answers', indicating a phishing or scam attempt. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://nipisod.ru/wix?keyword=chapter+5+exam+answers PDF link annotation
    • https://cdn.sqhk.co/jovowosifo/M2zZjbm/78565664184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367631/normal_5ff501de7280b.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/fjehbJj/notes_notes_and_lists_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_5fe8f514c524d.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/pihZh20/download_ultimate_robot_fighting_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/fedijadika/jbjagg0/real_space_3d_free_lwp_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/cjfLiaf/there_you_go_johnny_gill_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_601b3cdbe8617.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/jjdhihh/aka_to_blue_apk_patched.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_5fdc88e695648.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/Iiihcjh/aaron_jones_fantasy_value.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/XG2cbid/zifew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5fd1cd059f0e6.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/iep9xX4/80689998622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_604da0d950e70.pdfIn PDF document text
    • https://cdn.sqhk.co/gilitejeku/eoKaidH/passion_planner_academic.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/hijaCjg/cannon_shot_while_riding_his_bike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_6043bb8c570eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_602af176779c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_6024cc74ee6c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bovubodomumid.epizy.com/dajowujikafotoma.pdfIn PDF document text
    • http://nixuverojezuluz.epizy.com/global_medical_tourism.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/posenunejuga.pdfIn PDF document text
    • http://xekubizifakum.epizy.com/stock_market_trading_technical_analysis.pdfIn PDF document text
    • http://tigovakidif.epizy.com/streamline_english_book_1.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_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 5216 bytes
SHA-256: a0903d2d77a89191115d557cff1b8e8e3d561bdf4bb79b706bb8897119b5b7a1
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10200 bytes
SHA-256: 67912148f6b301b2791dcd221472f0e0e0d4b94dad01954788e07631c663f76e

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