Malicious PDF — malware analysis report

Static analysis result for SHA-256 935bb5350a755cd1…

MALICIOUS

PDF

82.3 KB Created: 2021-03-11 16:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 964440cb3e0ca879c1f70622a431617d SHA-1: 2db1afc88c10720d2c4fea35ef0669bbb1a28b22 SHA-256: 935bb5350a755cd1530f5cdde784f994ef33b77b57c811a968eda437d1ef76b3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL being https://botokaw.ru/wix?keyword=joe+magarac+statue+braddock+pa. This behaviour, combined with the ClamAV detection and ML classifier flagging it as Pdf.Phishing.Trojan, strongly suggests a malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=joe+magarac+statue+braddock+pa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480174/normal_600dde9ca558f.pdfIn PDF document text
    • https://sewolozifoguge.weebly.com/uploads/1/3/4/2/134235266/gofufadetaj_topatatabija_xarulabev_wavok.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/gkKrifW/heart_problems_post_covid.pdfIn PDF document text
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/bozatulukurovelit.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/vopatu-vatimakitalite-basag-bosubotefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_60496ddd212ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_5fd9f5cd631c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_600fecbcadebd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5fe01915c5b54.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/UZBjjid/dufaxavawudowirebi.pdfIn PDF document text
    • https://sowerijowirikuj.weebly.com/uploads/1/3/1/4/131437515/guvirumovab-geboguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_6029c3c9c567f.pdfIn PDF document text
    • https://cdn.sqhk.co/wivodojeg/fVhfhiL/among_us_game_online_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/kXhP9oF/senior_tester_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/fIhgGwz/vemepimurazozivemeraxixif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501975/normal_5fe15dd8cadde.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://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_df90443adb784779b810483de3fac366.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_05cee0cc22bc40018a5fa5333b2ededb.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_7e8ddeb2d45e4060ad23b44ee01225ba.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_19f0280fc97c432186046f97e337048c.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_42c75a5591f1415aa4d2a8d5ff01d99a.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_0af50fad680c48f791af038e342c696d.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_fb15b0b64f594a98b42e50af3c6e8a83.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_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 5280 bytes
SHA-256: a1e7f3ba9ee79035ade79526217c5a7c324b01411f8641d2a8cec79d8e783d42
font_01_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 10552 bytes
SHA-256: 11b5b05bf8b55488018d31497f8f27436098e8d0f804c03f5a79b24f6a9e93d6
font_02_sfnt_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230