Malicious PDF — malware analysis report

Static analysis result for SHA-256 c138690c19e0f13f…

MALICIOUS

PDF

78.4 KB Created: 2021-03-22 06:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1f07e09b117c55255b8c0cb63ae49469 SHA-1: c649968a83ad5ab89d6e7041c2e6eb695466655d SHA-256: c138690c19e0f13fbbe430bb490ebf7f7f59e79106808fae6dac85334de43c00
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The document body, though truncated, contains text related to 'Avery labels templates indesign', which is likely a lure to disguise the malicious intent of directing users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/123?utm_term=avery+labels+templates+indesign PDF link annotation
    • http://kodamup.22web.org/advanced_mathematical_concepts_glencoe_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/sghCgj9/30986200608.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/6jjhfha/7967319173.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/j2EFhjM/bugapijefevaxawik.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/jdijgg4/motor_world_car_factory_cash_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/f0jgKge/buxetalul.pdfIn PDF document text
    • http://kifegel.iblogger.org/base64_decode_to_file.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/QMijhho/archery_target_games_online_free.pdfIn PDF document text
    • http://dutusejutax.22web.org/minecraft_mountain_village_map.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/gjTjdhf/down_under_answers_website.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/ic6piiK/pacsun_cyber_monday_mens.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonufusova.rf.gd/romiladitotolotigupos.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_134c431342424cf99e4f3644c3bd9a6f.pdf?index=trueIn PDF document text
    • http://maligufaribez.epizy.com/marshall_stockwell_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/instrumen_akreditasi_puskesmas_2017.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_ad1cb8c6a608484db96119415a7e0c7c.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_07f033fdc6a841b38e3f0f8bd5fa6fdf.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_3b5f2e5dc1374998927f96b10d24df75.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_24eec3ef15c44ccebe5bb6e59c3c8e8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/lake_texoma_crappie_fishing_report.pdfIn PDF document text
    • http://fepobetef.rf.gd/67740788443.pdfIn PDF document text
    • http://dubirapotemudi.rf.gd/cartoneria_mexicana.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/delve_poe_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/dopezatikobapij.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/52734450941.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_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 5568 bytes
SHA-256: a2493fa09f403ddc899399e7f161a8ca2a0ef91546aa10d7c8cecf806eaa19dd
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 11032 bytes
SHA-256: f4e491f4eafdec7d89e6d29bc8b64aaf59c22ebefd76f7d3c7412639b44a8ee5