Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5403f540a8c81c…

MALICIOUS

PDF

91.7 KB Created: 2021-03-30 08:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3d82fa75fb2900dc385e1967778ea7e6 SHA-1: c5049df98df6811c551c6b87a849273d0aea7937 SHA-256: 8e5403f540a8c81c6bf70f6d5a5e0b10a7b258fb89bf4f636edec1c5903e81bd
186 Risk Score

Malware Insights

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

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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=free+warhammer+40k+codex+pdf PDF link annotation
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/f3b1bb9.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/ij78gel/80451048269.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ggxjfhe/breeding_guide_for_pokemon_sword_and_shield.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/9wvvN5C/football_manager_2021_mobile_beta.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/bohaty_tata_chudy_tata.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/gcZgc1F/98367368621.pdfIn PDF document text
    • https://duxapekekabi.weebly.com/uploads/1/3/1/3/131381277/f79dabef85.pdfIn PDF document text
    • https://disemiseses.weebly.com/uploads/1/3/1/4/131407045/42a7b45b7cdd.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/grocery_store_shopping_list.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorabuzep/hfjbMif/baludewobakowekisigajakin.pdfIn PDF document text
    • https://cdn.sqhk.co/tidapavibu/hdxgfgj/38619316628.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/ge6gjjg/plague_inc_evolved_apk_vi_t_hoa.pdfIn PDF document text
    • https://mowofagafuvu.weebly.com/uploads/1/3/4/5/134594922/tukozetusunetol.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenelavup/f9hdqoP/xosifegadezamew.pdfIn PDF document text
    • https://cdn.sqhk.co/dasekizob/haQiBBu/49080298669.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/dgieZhO/85186081337.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/BnAjcce/wanovebevufarana.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/fhgnwcX/xenejoniwukaxiperupurosus.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/8f0f2883-94ff-4607-a847-bb8a2791b3b5/19923609114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39883be-f735-4ab2-87ef-947720f48f8a/what_is_usyd_known_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62aa1120-a39f-41cf-9f90-5a9430426bc3/what_is_the_top_speed_of_a_50cc_moped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425f34f9-4c83-402b-833f-488d6a93d622/1557020383.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 5592 bytes
SHA-256: 10a0115ec4e358dc9027223340115b4915b05d7e7b865a1647f0728316eaf423
font_01_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 16068 bytes
SHA-256: f21a04f04219ef5eed4a27aa54e4a279849c4080e16e121d05005bf131e0bd86
font_02_sfnt_off00014c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C78 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330