Malicious PDF — malware analysis report

Static analysis result for SHA-256 895375b6da92f8bf…

MALICIOUS

PDF

76.6 KB Created: 2021-04-02 23:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2d15be6246da2b7195f6cc35a23938ea SHA-1: 12da3d635561ac0b5fd1d9dfa8e5a36ff6d6f3b5 SHA-256: 895375b6da92f8bf56529a0093dce2b3eebafc0366380381c606891da1caa78c
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 0.9997

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://dafemum.ru/strik?utm_term=taco+bell+soft+taco+calories+no+cheese PDF link annotation
    • http://1pokypki.website/samsung_steam_vrt_he_washer_sud_code8g3fq.pdfIn PDF document text
    • http://begemotiks.fun/which_activity_would_likely_be_performed_by_a_knowledge_workerqmfrk.pdfIn PDF document text
    • http://woodlesenka.ru/how_long_does_rolex_tritium_lastq5l58.pdfIn PDF document text
    • http://daimontimur.org/marriage_d_amour_music_sheetze60p.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/atlas_copco_compressors_llc_rock_hill_scdmxlb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_5c03401935154f19a50bd1e10224a171.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_53921f1107534e38ba5f9aa2552d3cce.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_e240ec5dfba0403ca99329c723e2a62d.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_000837fe883a4a6e9622881bbd9dab3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/android_create_view_programmatically_attributeset.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_fd421af156fe4a639c94a0c653a34bf1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b529468-e510-49d2-82ec-4617e97f7907/bijilorujezusapawedu.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/nusazix.pdfIn PDF document text
    • http://jalameki.epizy.com/aetna_medical_claim_appeal_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c43ce38-9044-491c-bb01-f307dbcdf8ec/what_are_the_most_unusual_phobias.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_61585a5430844887b94a5204cd9e0ebb.pdf?index=trueIn PDF document text
    • http://zutavifefif.epizy.com/coordinating_conjunctions_english_for_everyone_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63ebef3-d963-4063-a52b-7660ec22f16c/fijediximexanawewa.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_098c4902512345f8a7added86d0e48aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa7bbb4-521c-4353-a980-c0d04f164608/kiwafisatexoxowafakiruz.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_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 5060 bytes
SHA-256: f411da876c616006ae78a7039dbf871d07697c3ae07cf963291b4137e9427950
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 10348 bytes
SHA-256: 530e1c4bc30bbff23ce13637f8afa049dba8194fb3a931d174d6692669f3728d