Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57ddc418141d98b…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 12:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 773e3099a5fce8e50e7d5c947a76334d SHA-1: 74fe3d405794782f3a7c726ca452239a73becfe4 SHA-256: d57ddc418141d98b367f1f8bd1eab47cd8490b525d3a97b091e3938c19e49cfc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/award?keyword=kirchhoff+current+law+definition+pdf PDF link annotation
    • http://zavulibalox.mypressonline.com/71130887532.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/ljjhdpS/malignant_mesothelioma_treatment_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/ichaKgc/ninja_tobu_unlimited_money_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/ehfghWN/38363257049.pdfIn PDF document text
    • http://rimujitibux.mypressonline.com/essentials_of_diagnostic_microbiology.pdfIn PDF document text
    • https://tujemodi.weebly.com/uploads/1/3/5/3/135301643/4c64023768f488.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/fududepitoxo_fenatopod_datuji.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidaxiwuk/Shejfgg/87579641458.pdfIn PDF document text
    • http://dejepuzalew.mygamesonline.org/buck_converter_nptel.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/49011149134.pdfIn PDF document text
    • https://cdn.sqhk.co/poluxofad/hagdjbn/97163461757.pdfIn PDF document text
    • https://fedobakeruja.weebly.com/uploads/1/3/4/3/134367732/pumagonemugotip.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/giTiigh/fovedi.pdfIn PDF document text
    • https://vafuxukosa.weebly.com/uploads/1/3/4/4/134440110/6fe68e1.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/cjiid8O/smart_connect_gold_series_spinning_reel_with_bluetooth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/12db6c97-8137-47ce-8911-631d19e4e4b0/rival_6_qt._electric_ice_cream_maker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/24_roadmaster_granite_peak_womens_bike.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/cs_lewis_space_trilogy_hardcover.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/44953945216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2064a11c-3bde-4e02-bc9b-6514456b94ab/2008_toyota_camry_solara_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cdeff9b-de29-493a-b1f9-352ccd178c4f/71939757079.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 5124 bytes
SHA-256: 380eb84f3daec5bbd00e303e1b5cdb25dfc97a161e5f104c0d1fb5ea315f09bd
font_01_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 10976 bytes
SHA-256: 5feb201039ae2d159d5b2b9b9df688dca7c9480f46b921ff1e7bd12ba4610da3