Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e837e53fa6410f…

MALICIOUS

PDF

85.9 KB Created: 2021-06-11 18:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c428118e2f33311c01990d51344ea2fc SHA-1: 3d897fc4edb8e2b4b077df09f6237c3d602a91cf SHA-256: e7e837e53fa6410f3ff529718e5f928ccf58cc6542f90403a48f77a9e748ea6b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, and one specific URL is presented as a movie streaming link. This behavior is indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://cructi.ru/pbw?utm_term=the+hustler+movie+streaming PDF link annotation
    • https://gefererasixo.weebly.com/uploads/1/3/4/7/134749514/4930076.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/f6bd6882fe.pdfIn PDF document text
    • https://xewuligatojijow.weebly.com/uploads/1/3/5/3/135395235/xuxotikotepagubonak.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/vapamoruzud.pdfIn PDF document text
    • https://tedowinoni.weebly.com/uploads/1/3/5/3/135304389/03b8fe182c99ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_600b36fb6efce.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404113/normal_60b1117e71c75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_60698cd19a40f.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/e62fb1d1.pdfIn PDF document text
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/tevivoti_vusilesipow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_602c92c121311.pdfIn PDF document text
    • https://lulolopan.weebly.com/uploads/1/3/5/3/135323706/63bf2496f3cfb.pdfIn PDF document text
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/sasabowuvokakinozito.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/020b3385e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481513/normal_5fe0aadf1a582.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://uploads.strikinglycdn.com/files/563af3ec-473c-4c61-89bb-a8e4bba0f5a1/lewudefovuxakokevinakusoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fa25f9-43dc-48ce-a2ac-ecbcb66fecdb/ruger_lcp_9_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7608f560-526f-4d94-82a8-de8c3c163cdb/lelitorodobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91de73ee-da2c-430c-9672-11e2865d6b25/what_is_craftsmanship_in_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce53b80-eb35-4688-8601-9f8137b7037b/amaranth_leaf_nutrition_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61094eb2-309f-42c3-bd22-35bd7a8ac447/vevipudemakegebexof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ace387b-13e2-4615-bd3d-b8355720726b/can_i_learn_electrical_engineering_on_my_own.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2737954-364b-4cfb-8bf9-ca1f6aa77a2c/math_workbook_for_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ee7538-c965-4f10-b1c3-d5c89c28d7cf/87968748013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3932b49-c23e-4073-a3a6-cb7a67ac6ab7/tokyo_ghoul_manga_vol_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a25878-0648-4ef9-85fe-1113d28732d6/how_hard_is_the_aphr_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2853b616-6748-45ce-8979-e1fcaed19c0f/couples_therapy_workbook_kathleen_mates_youngman.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_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 4988 bytes
SHA-256: b118aff4e0871e259f3f6229008ba57c6bcee3dd43198d0f54396aca83099c5a
font_01_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 10932 bytes
SHA-256: a82e49340c09848408c71cd869cc0e6099c38182eaf67af98cb8aaeeab779f09
font_02_sfnt_off00013ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA0 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230