Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4a2dd760d9130e…

MALICIOUS

PDF

77.1 KB Created: 2021-02-15 10:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a454a7321a5d09e321179b9f7746c812 SHA-1: 7d44ea801cdaa836270ef3dfae90e43094e52d23 SHA-256: fd4a2dd760d9130e16b8c29406843db58ed1b5b75d536e8c8663b3629d77dc40
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=creative+3d+visualization+lamp+australia PDF link annotation
    • http://zdsshop.top/29876527846z0yp4.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/hdjiKEQ/best_heroes_grow_empire_rome.pdfIn PDF document text
    • https://cdn.sqhk.co/muvasesuru/d8hjdZE/bounce_classic_game_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/ghigfib/dupumunese.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/jjhe0ih/xcraft_drones_wiki.pdfIn PDF document text
    • http://stixlife.info/whiteboard_animation_software_for_pc_freelmb3j.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/5WpDqMi/varulujovasi.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/dhe7bhd/98676445395.pdfIn PDF document text
    • http://technodom11.com/soxetilewugisarowakidazuzh0km.pdfIn PDF document text
    • http://newowoliso.iblogger.org/futiketatejanipemetalot.pdfIn PDF document text
    • http://volosaty100.xyz/42677137063pe5pi.pdfIn PDF document text
    • http://morpeoplelife.ru/columbia_university_brand_guidelinesaexyz.pdfIn PDF document text
    • http://introdom.ru/personality_development_quiz_questions_and_answers826vy.pdfIn PDF document text
    • http://fbcopyright-center.com/ijazat_hai_songegvep.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/Cvgc7Pr/money_sound_button_simulator_revamped_codes.pdfIn PDF document text
    • http://bachanalytics.com/fafozunuwanakamegarull6mkx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://govogudumig.epizy.com/pamesefexusiledukenaw.pdfIn PDF document text
    • http://ziwitiko.epizy.com/xapopazodaroxorofukul.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/15432377926.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 5284 bytes
SHA-256: 68018938e447aa8efc332a615a78c65339a29d81216b74e9d6b701c047957bd1
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 10000 bytes
SHA-256: a8ecbc77ad5934f43036b6cb583dca0946850c57de8dd5ef996cf23a33fc3a4c
font_02_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
font_03_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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