Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ff6a0e6ef9a65a…

MALICIOUS

PDF

74.3 KB Created: 2021-03-23 13:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35204cc86ad0b2ca2faad6469a936e5e SHA-1: 6703768eb8869dae8177a59e2f5162c0e4c89634 SHA-256: 22ff6a0e6ef9a65a71f4e87965289b3d4fdcb29504a20617399ea0a9431f1e2d
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 0.9996

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://maypoin.ru/wix?keyword=unit+8+quadratic+equations+graphing+quadratic+equations+answers PDF link annotation
    • http://kuvesukide.iblogger.org/ikea_kitchen_installation_guide_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5ff05dcd57005.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/a7jbhan/space_jam_2_trailer_espanol_latino.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/MieLbjd/19915978774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_5fd644a641b61.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/hGelUmo/rowote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418963/normal_5fe4264c62fea.pdfIn PDF document text
    • https://cdn.sqhk.co/mubasetopagu/njbKhi4/ordinance_or_law_coverage_condo.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/cgibhbk/10205334433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6037c29c72a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447914/normal_5fe5325fce452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_603b33316d6c0.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/DUmgdZL/mosaronulugonubuluz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_fe08c2a34ed84b988f770fd5d3f4095e.pdf?index=trueIn PDF document text
    • http://dekefolujif.epizy.com/cholesterol_guidelines_2019_aha.pdfIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_c35b62b5ae8b4155a28cc2508139ea64.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_17af7cedf4274d659c00b5cd36beca7f.pdf?index=trueIn PDF document text
    • http://mivuturirem.rf.gd/vazomiwasiko.pdfIn PDF document text
    • http://xapemekofutomun.rf.gd/n_c_d_c_full_form.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_63efccaa05ae4e2ca9cd1b672ebef3fa.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_72a81351c3f447be9f1011ee3f0deeeb.pdf?index=trueIn PDF document text
    • http://betupaxomivokab.epizy.com/context_clues_3._7_worksheet_answer_key.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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 5704 bytes
SHA-256: 7c28fb6dffbe7e15a705ff0341ece0f729ceacb025e79a925fe81ad9b1178a56
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 12108 bytes
SHA-256: b8dbf9a3a78e019d97493141481678868b78d2400619318841bf7c4da51b81a5