Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11de5a1252fc9e8…

MALICIOUS

PDF

90.5 KB Created: 2021-04-02 11:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aaaa6824f6fa54d136acb48cf09af8e SHA-1: 76ab99f8ace9e422c0c60643c6eee78348fc5f0b SHA-256: b11de5a1252fc9e8d89674fd7c09494252fa39a0f8761967a794738319e5b77c
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'ffa worksheet answers'. No scripts were extracted, but the presence of external URIs and the phishing classification strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=ffa+worksheet+answers
    • http://euroshopmn.space/jufotefoluxezajemug973in.pdf
    • http://daating19.site/information_about_neet_form_2019ve1tc.pdf
    • http://rometinanuk.iblogger.org/35374327153.pdf
    • http://siondez.ru/6927456401954aat.pdf
    • http://firejowetawo.iblogger.org/nuzovupopole.pdf
    • http://diwejibazetar.iblogger.org/tubemate_video_er_latest_version_apk.pdf
    • http://salearea.pro/93074045266vputj.pdf
    • http://fezatubiwe.getenjoyment.net/devi_bhagavata_purana.pdf
    • http://wikuseweluwi.iblogger.org/stretching_exercises_after_workout.pdf
    • http://nicepics.xyz/882337282030xk52.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dijinisefiregot.rf.gd/13499317014.pdf
    • http://detotoga.epizy.com/vesesi.pdf
    • https://uploads.strikinglycdn.com/files/9152db0b-a432-4e19-bdf8-257a2eefc8ec/van_der_waals_constants_table.pdf
    • http://sulopemod.epizy.com/mahatma_gandhi_biography_in_odia.pdf
    • https://uploads.strikinglycdn.com/files/926463f5-432d-4668-b2e5-efabfafa86c6/zikisolejugunilavalunem.pdf
    • http://rekutuvogunavur.rf.gd/15912856321.pdf
    • https://uploads.strikinglycdn.com/files/6ecaece6-9dff-4303-9c34-37d59305d6cb/jukejogukomezofojafog.pdf
    • http://pekamidakoj.atwebpages.com/66233585095.pdf
    • http://wumugajus.onlinewebshop.net/fobad.pdf
    • http://kepofif.onlinewebshop.net/indian_historical_movies_imdb.pdf
    • http://tatenawagoxibe.epizy.com/91773258841.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb3c.bin
1a0d123745438405d14c1210f8d2337890e4d201c0a5b415acb9e62e35c7fb95
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 13268 bytes
font_01_sfnt_off0001260e.bin
a93d8b8d753b1dfe55547c86ca17b58bc7d8cccef165dad0b3b05b517c4fdcf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 4932 bytes
font_02_sfnt_off000136ea.bin
28b2b46e178a5a674b9699327c2ea33eaecb5bef32422ea050bb2988df719fe0
pdf-font-stream PDF embedded font (sfnt) at offset 0x136EA 10640 bytes