Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62bbad9bda1138d…

MALICIOUS

PDF

72.5 KB Created: 2021-02-15 10:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e7ef60b580d6f1b1b4ba4c103c280922 SHA-1: a0350dd8e91d81fcd64a55140d78e8e9d7fa1865 SHA-256: b62bbad9bda1138d1ef8159d0bc664f1bda8c7bb2bfae8abd1651e34ed9e38a5
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to a typewriter manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish credentials or deliver a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=olivetti+lettera+32+typewriter+manual In PDF document text
    • http://xapozibun.22web.org/24377131659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496005/normal_60093c6cd2585.pdfIn PDF document text
    • http://onlinekartiadesi.com/495415300265v1ho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5fd650091b580.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/9768980.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426690/normal_5ff615629e19b.pdfIn PDF document text
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/daf31b18.pdfIn PDF document text
    • http://belplitka.ru/66109262252aug3j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/reported_dog_bites_by_breed_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/vukubosibaxokinidufigek.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/eliciting_sounds_book.pdfIn PDF document text
    • http://pomedunud.epizy.com/xugoruripuzo.pdfIn PDF document text
    • http://makijozexu.rf.gd/22534886943.pdfIn PDF document text
    • http://suwapazuxesara.epizy.com/82363643244.pdfIn PDF document text
    • http://mibozoviken.epizy.com/dovoxo.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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 5364 bytes
SHA-256: e28b6589905525d65651aa034147102793e88bc93d191aca39d58b21844138e9
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10176 bytes
SHA-256: a0f1e282e11dfbf172b5c152aefcf3c6d5a8e205d664e0e131a81ff455e66589

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