Malicious PDF — malware analysis report

Static analysis result for SHA-256 7879b954735b4760…

MALICIOUS

PDF

77.2 KB Created: 2021-04-26 15:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b847f723f7296a2b4c0b18f8c0d1f4fd SHA-1: 9db1886cae527be909733634e79af2690165767b SHA-256: 7879b954735b4760632e9eec235d3aac29c0695f0f3b6182a26f4b1fe5156cdf
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 0.9991

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://leonvi.ru/strik?utm_term=redemption+of+partnership+interest+tax+treatment PDF link annotation
    • https://cdn.sqhk.co/kubepugemaki/hKJifje/28477144166.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/dapedenesixefigiralu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_6053355a40f5d.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/hhiyWF0/litavogerawodana.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/kOhhgfk/zaradalakadetapekasenakus.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/HD3jgiB/16743199070.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/hdUibja/kaxogolutenulodobipez.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/hfmhhgf/lego_batman_dc_super_heroes_game_characters.pdfIn PDF document text
    • https://tonawonigavima.weebly.com/uploads/1/3/5/3/135345065/detilefafonorud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5feba423764b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_60302ce4f0f20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409627/normal_5fcdb71790fca.pdfIn PDF document text
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/jemumi.pdfIn PDF document text
    • https://cdn.sqhk.co/givinonu/FggAZJm/labyrinthine_fistula_vs_perilymph_fistula.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/geid8oP/fozezemetafako.pdfIn PDF document text
    • https://nabezaxe.weebly.com/uploads/1/3/4/8/134852032/f96cafc6219.pdfIn PDF document text
    • http://wosutopanoba.mygamesonline.org/flywheel_energy_storage.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/SXiajj2/fake_gps_go_location_spoofer_free_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376379/normal_5ff29dc821558.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/leadership_and_teamwork_book.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/brand_value_vs_brand_equity.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/jiyjiFE/64322607904.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/Jgijizd/rejedowaripitebatogobusuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rivenoke.onlinewebshop.net/audience_research_methods.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_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5324 bytes
SHA-256: 317b2d9dc565e95a42f73c0b69d43f0772eef45db585cd6ecc4aad8afb46852f
font_01_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 10396 bytes
SHA-256: dec8098b82ff2dd43a021edfc78ca917a931d6a8da16b0c7ce8871516bf3b78f