Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b4199bf117b7e4…

MALICIOUS

PDF

75.8 KB Created: 2021-05-15 04:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 446029a95b9e7466bf8f52d740d57657 SHA-1: 290bca7da80947afbb32b3bbca913c7fa9ca97f3 SHA-256: 43b4199bf117b7e492b091cac0091bc3ab933be78b5970f6a1c26a4c3326d65a
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or scamming. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=can+i+terminate+my+commercial+lease+early+due+to+covid PDF link annotation
    • https://zegokovoni.weebly.com/uploads/1/3/4/3/134323662/4649145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459939/normal_6068b482a11d3.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/bhgMhaL/super_unblocked_games_hacked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473375/normal_5ff8c64cb364b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_60222ad30affc.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/dKgi1TX/77374448416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_604cbe9ec947a.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/gjeigji/i_viking_valhalla_creed_war_battle_vikings_games.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/mejujurikal_xatexozajoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/dV9kHGk/e_coli_in_urine_specimen.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/zjjiiKc/mitizopenedufukotavisu.pdfIn PDF document text
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/3cc370fe62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_605b0e2ec6bb6.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/dig7heU/47579030268.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/gfjDjeE/88575647346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_dfe5bca4d8ff4d7587a14a7b2d08260e.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_677130536c424a5499a8f6133d8aa4be.pdf?index=trueIn PDF document text
    • https://b47237a6-1880-4d87-9598-f01162bab054.filesusr.com/ugd/1fe0ea_9eeb17c477434e3dbd74410907488466.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_cd3f4ee778ce40bd8293ff7d34cd7c14.pdf?index=trueIn PDF document text
    • https://c8ff5639-09d9-4535-8c68-e7569a30476d.filesusr.com/ugd/0bcf16_f94ab5bec6f24e6395c9680d01f2445f.pdf?index=trueIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_8748ad6650e14a82a890c9866b29dd03.pdf?index=trueIn 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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 5152 bytes
SHA-256: 5f2f1c794e5d49791824a6be14475dcaf39b6193d06030a228f73d14fae32b1c
font_01_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 10372 bytes
SHA-256: a44c46333d4999c2d3ce7843a2120d88187c0f62b8c34fa2e8e0e95c10d56919