Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b61d7e55bf74eed…

MALICIOUS

PDF

75.6 KB Created: 2021-03-28 16:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cce3f76964b1fa1e2589934d6e287cd7 SHA-1: 44fb5306bc283d6f8a2c5aeda5e2e4f34c52367b SHA-256: 0b61d7e55bf74eedde0745f294acc7c8eb583c10db27ffa7d68b9236ec27938c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a large number of links on low-reputation hosting, likely to distribute malicious content or phish for credentials.

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://bologen.ru/123?utm_term=android+8+backup+messages PDF link annotation
    • http://mirumumavetifun.mypressonline.com/69262981251.pdfIn PDF document text
    • http://gimazazutakegi.iblogger.org/do_all_samsung_tvs_have_audio_outputs.pdfIn PDF document text
    • http://save50it.pro/is_mechanical_engineering_good_for_future86pvo.pdfIn PDF document text
    • http://logmeinnow.xyz/jeux_de_cartes_a_deux_simpletbqtj.pdfIn PDF document text
    • http://prizinsta.info/lamemo25oc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443821/normal_600107e08977d.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/vilixalajixebigawifag.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/pisidipuxifisegizerime.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/3173396ceff0.pdfIn PDF document text
    • http://physcoo.com/83435026632ctvod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_5fd91be6f0bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_6058400dd7335.pdfIn PDF document text
    • http://snt-br.ru/topebaxapukato2fs4d.pdfIn PDF document text
    • https://fexiragija.weebly.com/uploads/1/3/1/4/131409693/6727592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/75465508425.pdfIn PDF document text
    • http://jilagikudi.rf.gd/accenture_case_study_interview.pdfIn PDF document text
    • http://losebur.epizy.com/20717550592.pdfIn PDF document text
    • http://zininorenedalo.onlinewebshop.net/vesipukurisevotapi.pdfIn PDF document text
    • http://jugugesazo.myartsonline.com/succession_planning_steps.pdfIn PDF document text
    • http://savekuf.rf.gd/bomapozolubu.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/the_accursed_kings_free_download.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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 5748 bytes
SHA-256: cd021a2b86a4cd3b8490f4bd5e371a0630a2ec8f68ecc268bc35b4601060f2c8
font_01_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 10684 bytes
SHA-256: ca79ebb55b0d9c86e56dbc5cf5797d4bfd89c9206a72cbe0e3f82853b6bfdee1

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