Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbb29e22cb25a34…

MALICIOUS

PDF

77.1 KB Created: 2021-05-13 19:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfb46646fd9125916de5b8daa4d60a17 SHA-1: 54e2a3968006f01e6e64f86912fb334f29379955 SHA-256: 7fbb29e22cb25a340fd64ab653286acbb8b97c2c206ef47ab9bb7ce67645f3f4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a product name, which may be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=ipod+touch+4th+generation+glass+replacement
    • http://brumbum2.xyz/kivinb7qdx.pdf
    • http://wojisub.mypressonline.com/demokidalogem.pdf
    • http://jedusajinud.mygamesonline.org/nugopiworododubapi.pdf
    • https://cdn.sqhk.co/suxavawudomo/Zlgiage/xuguj.pdf
    • http://rujitexoxobag.mypressonline.com/nielit_ccc_application_form.pdf
    • http://greatholl.com/femudutogiweryk65y.pdf
    • https://cdn.sqhk.co/pabelemusib/7ibfhgf/10204796886.pdf
    • https://cdn.sqhk.co/gaxobenona/cNUiihh/sandbox_3d_mod.pdf
    • http://fikosarodone.medianewsonline.com/ich_validation_guidelines.pdf
    • http://kojazunupetip.mygamesonline.org/is_saying_fine_rude.pdf
    • https://cdn.sqhk.co/nopawuwam/Lhf4Vcv/drag_race_perfect_shift_racing.pdf
    • https://cdn.sqhk.co/futidiwe/FtjbGfY/34781087707.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_868d1d3a503443758bc97e34d2c69aa3.pdf?index=true
    • http://rolozaj.epizy.com/geometric_sequence_worksheet_kuta.pdf
    • http://ravuleg.epizy.com/alcon_rebate_2020.pdf
    • http://samipada.epizy.com/vekowuragufe.pdf
    • http://guniwazozosuriz.rf.gd/a_valiant_life.pdf
    • http://wexoloxi.rf.gd/free_movies_websites_in_pakistan.pdf
    • https://s3.amazonaws.com/jarawaxanivu/online_admission_form_for_ma_in_ignou.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_3f3b0d2413b34aeebe0e60be4d405ff3.pdf?index=true
    • https://s3.amazonaws.com/resixexi/bissell_cleanview_swivel_rewind_pet_upright_vacuum_model_2739.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef49.bin
43dce61e760b977edf6c1ab20fb33aa8e166e5487b8845407d6a34992a0e35da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 5512 bytes
font_01_sfnt_off000101eb.bin
686a21c64386d8786f2ad887f45e160f34fbcd4329e19ffb1fddbabf447cacb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 10844 bytes

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