Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d2985e57f7d4b0…

MALICIOUS

PDF

80.9 KB Created: 2021-02-13 06:16:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 33663fdee05f5ec997557474d2092395 SHA-1: 2d01ff0803b236d02a3b7d4f98e8f5e65e8655e9 SHA-256: 21d2985e57f7d4b01da88ef98766c8f6f6a918c6dc70752ec0822146b9395217
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/wix?keyword=atoms+form+chemical+bonds+using PDF link annotation
    • http://digitaltoolsfor.xyz/precalculus_graphing_sine_and_cosine_worksheet_answersafx4w.pdfIn PDF document text
    • http://theharaka.online/possessive_adjectives_worksheetuycrz.pdfIn PDF document text
    • http://jotelefaxomawut.22web.org/fekinit.pdfIn PDF document text
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/aedc519c.pdfIn PDF document text
    • http://ufenmac.com/maths_worksheets_year_8_printable_freep7fly.pdfIn PDF document text
    • http://bigmagazin.xyz/chloroethane_staggered_conformation_point_groupxrmkp.pdfIn PDF document text
    • http://realnoe-obshenie.online/seponowitis3z3f3.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/Hhgjjnx/soft_serve_ice_cream_truck_rental_nj.pdfIn PDF document text
    • https://xegadoponuxi.weebly.com/uploads/1/3/0/7/130775279/welomutu.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/brNgevM/64622418897.pdfIn PDF document text
    • http://front-glass.space/96613996093ndbl0.pdfIn PDF document text
    • http://milano-moda.space/16737484245x8ee7.pdfIn PDF document text
    • http://firstdoctor.xyz/64983063500obd1i.pdfIn PDF document text
    • https://cdn.sqhk.co/soboxuxafiso/fP62ahc/xosafalinaloto.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/aejfPtb/90692482532.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/ihbngh1/zamixikerani.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://riwatarabopa.rf.gd/tamilrockers_2018_hd_movie.pdfIn PDF document text
    • http://bedozep.rf.gd/banff_centre_map.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/federal_employee_hotel_tax_exempt_form_pennsylvania.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/chrome_canary_mac.pdfIn PDF document text
    • http://gagelenobom.epizy.com/avengers_endgame_song_in_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/ibiza_netflix_parents_guide.pdfIn PDF document text
    • http://tufukupetateto.epizy.com/boogie_woogie_bugle_boy_piano_sheet_music.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 5448 bytes
SHA-256: daec05e5fca5defcee1d1a857f874e6fc5e3bcda498f7e5153c1b57800cf2072
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 10940 bytes
SHA-256: cf3d60ba6a11846ccc1368d938c4e9e9080d6e3b1a72c9836e016fa1572b9bec
font_02_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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