Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec31349ccbddfd82…

MALICIOUS

PDF

81.3 KB Created: 2021-04-06 23:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e5548a82d9504858d0dac8ffd83a2633 SHA-1: aa6909b2162348084ac2d086cc4c11a733e1ea70 SHA-256: ec31349ccbddfd82d96e669d6d420b5a6f1bb9bd9927a6622605829b71af66d1
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 0.9990

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://vilenefex.ru/123?utm_term=curl+pattern+guide PDF link annotation
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/siwasexozu-kufem-maxevig.pdfIn PDF document text
    • http://antinomi.design/afghanistan_passport_online_application_form9d4ms.pdfIn PDF document text
    • http://forsage.pw/91135350725tuojb.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/raxik-jisowatekila.pdfIn PDF document text
    • https://wabatopopelak.weebly.com/uploads/1/3/0/7/130775953/47a14.pdfIn PDF document text
    • https://xanibizodiwanid.weebly.com/uploads/1/3/4/6/134614549/zilugukesologurize.pdfIn PDF document text
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/mitawi_wanagivijiwire_vesif.pdfIn PDF document text
    • https://rujizubag.weebly.com/uploads/1/3/0/7/130776042/junijapax-kojilu-vajavuxadusikor-zivakolabuk.pdfIn PDF document text
    • https://gavatuwideziwi.weebly.com/uploads/1/3/4/3/134352821/9369902.pdfIn PDF document text
    • http://sibuvre.com/air_force_ones_womens_black7scoi.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/zomepefobolawi.pdfIn PDF document text
    • https://naxaletuzo.weebly.com/uploads/1/3/4/5/134508506/bubisovakaw-zetuva-nemuxoge.pdfIn PDF document text
    • http://thedefenseforge.com/sherlock_holmes_2_hindi_dubbed_movie_download_filmyzillafpp3j.pdfIn PDF document text
    • http://zabavnyi-slon.ru/1_pulgada_cuadrada_a_centimetros_cuadradoswrw62.pdfIn PDF document text
    • https://mizefowoxeze.weebly.com/uploads/1/3/4/4/134485365/jobevez.pdfIn PDF document text
    • http://pubgmobiie.com/junavavetakmivg0.pdfIn PDF document text
    • http://private-channel.site/47001068255ak0df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_4a8f27b2c7834000bcc22c27538fe8a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00987377-3641-45ed-9902-8a1fa3e21602/beethoven_piano_sonata_13_pathetique.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_0077c28984b147dd9dee1419dbcbe902.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16056def-5018-454d-9ab4-2990ee169b1f/the_egypt_game_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b781f3ad-fdda-4f0b-b5a1-22858a96c4ce/kikuxuwuwisarumijotom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5033920-fbcd-4f9f-9956-e434e12c4a0e/cal_mol_to_kj_mol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57599fd-a106-43bc-bb7f-b196be673ccb/pop_art_hashtags_on_instagram.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 4744 bytes
SHA-256: 3b01f977ee81656851a2ca696f19b60b10ef318b6ff5294aa5ac67119ec922c4
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 11652 bytes
SHA-256: 4a21566a44fad36c505de8f4e35ed13aa4bfb911e3dbca376aa9173846164ab1
font_02_sfnt_off00012a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A90 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176