Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35b8401b643592a…

MALICIOUS

PDF

94.4 KB Created: 2021-04-03 10:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 20686f8772fe0ed70b7382448c376cba SHA-1: 992a3dcb86bd7ea7fe46c2fba0229fd195e0c7a9 SHA-256: d35b8401b643592af6c9a30fb684f899567ad5540b0ca48a2752e697d1e306ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/123?utm_term=order+anseriformes+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5fd1acd9b995e.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/16113117413.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/4e1IShd/dotuduwexijewazewizi.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/xuxorabis.pdfIn PDF document text
    • https://cdn.sqhk.co/xevuvuxene/Phejihd/acca_p4_lectures_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394061/normal_6004c1c4686e7.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/ii1ijCD/flower_puzzle_game_poly_art_3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_604fb34ed9450.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/basic_principles_of_effective_communication.pdfIn PDF document text
    • http://mavafesumej.medianewsonline.com/online_converter_to_word_document.pdfIn PDF document text
    • https://cdn.sqhk.co/zizaratijiga/jahgAjc/assistive_touch_iphone_xr_ausschalten.pdfIn PDF document text
    • http://keluzizizeroki.getenjoyment.net/repurosopot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374009/normal_60090c72af735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5fe9344801886.pdfIn PDF document text
    • http://fonujameritules.getenjoyment.net/sir_syed_ahmed_khan_biography.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_604f72bf738b2.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
    • https://uploads.strikinglycdn.com/files/bb117764-6918-4d60-a50a-4fb93a47d255/sony_xplod_1200w_subwoofer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa78b13b-4011-4f35-ab3b-d2b2cd0ec35a/64234961520.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/pirevi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 4992 bytes
SHA-256: f1393170d505f4df431c158af3c243bd5e2813c37124b87f1885da52cbfdf3f7
font_01_sfnt_off00012b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B32 1716 bytes
SHA-256: 7775e8e7c4329a1c5bd112c001158d8940360085fc48f9208aadc231de0e3d90
font_02_sfnt_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 13196 bytes
SHA-256: 60bce0d7bba547f8c956a7b79b9ac62ea76bc7a5b1e17010c997deee6beb757d
font_03_sfnt_off00015e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E10 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378