Malicious PDF — malware analysis report

Static analysis result for SHA-256 612145a1ba6dc498…

MALICIOUS

PDF

77.7 KB Created: 2021-03-19 01:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cbca77584d08eb92fb518c3e455c1c52 SHA-1: cdf0bea5c839e47f75490405c17023beffeb235a SHA-256: 612145a1ba6dc498c8e9e3b38139cec26a6524395ceb8fe1ac4e6ceb82d6c012
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm used for redirection. The primary URL, 'https://golowaki.ru/123?utm_term=thermal+insulation+board+data+sheet', is likely part of a phishing lure, attempting to trick users into visiting a malicious site under the guise of a technical document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=thermal+insulation+board+data+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497687/normal_601727e89ede3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_60386ac4e3070.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/lifimora.pdfIn PDF document text
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/puniwana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385437/normal_5fe001081f47b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_5ff2b26b4c8d4.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/56045546006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471692/normal_602cd8564faa1.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/83828785806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_60160526e086f.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/jikovetuwoso-gunutap.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/gotiduzufezowaso.pdfIn PDF document text
    • http://xiviwuk.iblogger.org/57736216429.pdfIn PDF document text
    • http://naxifobekip.22web.org/16238066524.pdfIn PDF document text
    • http://palopej.sportsontheweb.net/22232032982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5ff75d6b1de48.pdfIn PDF document text
    • http://xokebidukefu.getenjoyment.net/the_amulet_of_samarkand_audiobook.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://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_4565b188b0814cfbaa629f0711cd4548.pdf?index=trueIn PDF document text
    • http://kifavudufolafu.epizy.com/the_kybalion_espaol.pdfIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_2a997eafb55e48e29a641b44bfdc1047.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_70aaf689c24f4b20999bc5f667f80ea2.pdf?index=trueIn 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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 5036 bytes
SHA-256: 389323a096455bd9e22a770811b3e43c2574f4d7d17a4af291b077e8d4f13464
font_01_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 10628 bytes
SHA-256: e23973bfa677ff6c958e3183b11424f7f9eee2c59d8492ef48df3c940b6523c7
font_02_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2