Malicious PDF — malware analysis report

Static analysis result for SHA-256 637583cbab7ef051…

MALICIOUS

PDF

93.3 KB Created: 2021-03-07 00:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4ab52ad3744de2438d2ea0cc97dde3de SHA-1: 12577830416926465989f89a14ff1b52fefa5c4c SHA-256: 637583cbab7ef0517b796ae4f243f1f97773b268993001898fbee79c32f447ca
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, https://jumiwimov.ru/aws, is likely used to redirect users to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/aws?utm_term=portfolio+light+fixtures+lowes PDF link annotation
    • https://pitamiled.weebly.com/uploads/1/3/4/0/134098016/516453a79.pdfIn PDF document text
    • https://ropaligezavizaf.weebly.com/uploads/1/3/5/9/135962070/5698785.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/b56c3d6a2dd4da.pdfIn PDF document text
    • https://semoburepov.weebly.com/uploads/1/3/2/8/132815840/8379071.pdfIn PDF document text
    • https://tibijipobarak.weebly.com/uploads/1/3/4/4/134493900/03b484284500a.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://s3.amazonaws.com/napisakaluja/addiction_procrastination_and_laziness_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395091ee-5497-487a-922a-7bdf1f3852ba/cant_feel_empathy_or_sympathy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624624fa-3dcf-48a8-9a52-b5aaaa7ff587/c_sharp_reference_types.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/asma_idai_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0c29a4-60e3-4f8c-a984-c2c4456f0807/51992987986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a00eddd-3d5f-4921-8550-5a55a11fdd4b/agatha_christies_poirot_season_10_episode_2_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db6e940-e018-403c-a8ca-6b718b7b9a18/34798961898.pdfIn PDF document text
    • http://degudodenotiva.rf.gd/cyber_security_awareness_training_army_answers.pdfIn PDF document text
    • http://kizifisen.rf.gd/what_is_the_effect_of_an_invasive_species_on_an_ecosystem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d972122-e3eb-4887-980f-0e4b985c71b5/fagor_pressure_cooker_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/direct_and_inverse_proportion_word_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da18bcc2-0c93-457e-96da-89e0cfcc1919/rexavagajumurufeb.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/dojegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36196d2f-0db0-4f7b-98ef-e2d5481e2942/23592358364.pdfIn PDF document text
    • http://foripoj.epizy.com/google_translate_extension_for_android.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_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 4756 bytes
SHA-256: 514627c5e2f4357b93616347b2b0fd130b8338d657cf687f323260502ce146fd
font_01_sfnt_off00012fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFF 12432 bytes
SHA-256: d858b7517a13872344d70fdc2f2ed49dc0cfa9598d04d8839bbea8b8d2d83d03
font_02_sfnt_off00015a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A02 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3