Malicious PDF — malware analysis report

Static analysis result for SHA-256 655550136ade1eab…

MALICIOUS

PDF

78.8 KB Created: 2021-05-28 18:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e72cbbe4d3975966bdbd1906fb25e476 SHA-1: 554dcc7e29b750e7ec7e10db95c79e2a2becc46b SHA-256: 655550136ade1eabe5dc928a5c03803b1ba77cd61acb244488ce681d408912fc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary URLs extracted, 'https://bologen.ru/strik?utm_term=how+to+subscribe+on+twitch+mobile+with+prime', suggests a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect the user to a malicious site, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=how+to+subscribe+on+twitch+mobile+with+prime
    • https://cdn-cms.f-static.net/uploads/4380393/normal_605d16fc20406.pdf
    • https://votilolezin.weebly.com/uploads/1/3/4/3/134307270/3244697.pdf
    • https://zinexosodolawiw.weebly.com/uploads/1/3/4/2/134235462/5245976.pdf
    • https://litunuvojiv.weebly.com/uploads/1/3/0/9/130969221/sedefuxefibap.pdf
    • https://revotifolalowo.weebly.com/uploads/1/3/4/7/134716495/73b664761863.pdf
    • https://cdn-cms.f-static.net/uploads/4412780/normal_603aeef2255b1.pdf
    • https://tinubuwetoka.weebly.com/uploads/1/3/5/3/135325034/sipis.pdf
    • https://katebobuwusa.weebly.com/uploads/1/3/1/3/131384636/dudabesopesijo.pdf
    • https://zoxutelipiroga.weebly.com/uploads/1/3/1/8/131871488/vuvorizisarij.pdf
    • https://kixujededewi.weebly.com/uploads/1/3/0/8/130814479/bipusivezajetov.pdf
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/dabigunodebu.pdf
    • https://tinalolovini.weebly.com/uploads/1/3/4/3/134371967/redaxatidojijab.pdf
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/6847824.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c58f599-b90b-4108-a777-f6e655543ea7/honda_rebel_300_abs_2019.pdf
    • https://uploads.strikinglycdn.com/files/d28af41e-0dc0-4dba-8346-8919c7ae1afa/which_course_is_best_to_improve_english.pdf
    • https://uploads.strikinglycdn.com/files/6b472d35-0740-4d08-b719-713ab6a15401/lijobanomufuwupev.pdf
    • https://uploads.strikinglycdn.com/files/6e906d49-4983-4ce1-a1e2-37c2e867037f/wutukunojegej.pdf
    • https://uploads.strikinglycdn.com/files/2efa1a03-84f9-47ca-bb6e-9dfd9a83c160/williams_sonoma_bread_machine_recipes.pdf
    • https://uploads.strikinglycdn.com/files/b58d63ae-39de-4022-b944-f11cb8f7534b/67699214216.pdf
    • https://uploads.strikinglycdn.com/files/6d151399-187b-49a9-a692-38253cc07de6/a_thousand_splendid_suns_book_review.pdf
    • https://uploads.strikinglycdn.com/files/a6464d9f-eef9-4e6a-8fcf-4bb2405c7c26/production_accounting_for_dummies.pdf
    • https://uploads.strikinglycdn.com/files/daa032a3-9a3f-4d9c-9001-9d01b12a207f/ipod_nano_7th_generation_bluetooth_specs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64a.bin
7b06774382dc7518d6006f5a872d42e940178121ee0a60890090ab4426c19b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 5156 bytes
font_01_sfnt_off000107b7.bin
a76fcc06e44c449c4b2a92e51b1e4e4a4d91b1687e719aefe0f29edd6d519517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 11152 bytes

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