Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa1ed9e3e1a4e6e…

MALICIOUS

PDF

80.0 KB Created: 2021-04-06 06:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9bade7d50ac6b1582e2b7d9f6d8f6bef SHA-1: 8bd1bdb1eba2a0af2623c574c4b028f98d6586e6 SHA-256: ffa1ed9e3e1a4e6ed9c9ea0a72f0c118dfd733856987b745db815cb70b4f48ab
126 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 pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains metadata related to a humidifier manual and the wkhtmltopdf application, which is likely a lure. The ML classifier strongly indicates maliciousness, and the presence of numerous external URLs supports the conclusion that this file is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://nipisod.ru/wix?keyword=vicks+starry+night+cool+mist+humidifier+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420930/normal_600febfa31c12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_6049ab21c40af.pdfIn PDF document text
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/92f50296d090.pdfIn PDF document text
    • http://movebomuxujolep.22web.org/39409951060.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/1b1c06.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/xorifizimodo-gizanobu.pdfIn PDF document text
    • https://gapemudumowew.weebly.com/uploads/1/3/1/4/131437765/damanabot_fuwetawoleko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_6026314dd665a.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/tukedapitinazijosun.pdfIn PDF document text
    • http://jolilibigir.22web.org/parchment_paper_sheets_costco.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_49a32dc779714be08c07bc49a2a88f2d.pdf?index=trueIn PDF document text
    • http://zufakugofozufi.epizy.com/3699750708.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_b2bc1fb087d445c09777b8935ab79154.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/chrome_extensions_android_ublock.pdfIn PDF document text
    • http://mozizilusonasij.epizy.com/mcqs_on_protein_structure_and_function.pdfIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_c8fc3f60be504d9dab89d1c03fbd758b.pdf?index=trueIn PDF document text
    • http://kosejoviwo.epizy.com/14998975051.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/6._2_indirect_object_pronouns_answer_key.pdfIn PDF document text
    • http://pabipinipimano.epizy.com/computer_science_vs_electrical_engineering_salary_reddit.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/sap_bods_trial_version.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_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 5568 bytes
SHA-256: f1a9fd489608a9366ddd71cdc651eedc963781e1828b208c8cf1b9d01e0fedea
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 11148 bytes
SHA-256: 7a21b27e6b11bbe0d496fd7aac138164ba5fd18dbbb7f9982a1e63dde69d802f

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