Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb422bba574043c…

MALICIOUS

PDF

74.9 KB Created: 2021-02-23 05:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2d7e18c29d9d7dee81d519121bcc4a32 SHA-1: 4b4296d5749b5914818ed1517e521464d6a09bad SHA-256: bdb422bba574043c75c4ff1593bd94bbf6ed458ed3b0b691f78942143b5ab774
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though partially corrupted, contains text related to 'Starbucks coffee cups with lids' and 'wkhtmltopdf', indicating a potential bait for users searching for specific products, which is then used to host malicious links.

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
  • 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=starbucks+coffee+cups+with+lids PDF link annotation
    • http://shimano-stradic.ru/22644667576map5e.pdfIn PDF document text
    • http://healthit.space/aditya_hridaya_stotram_sanskrituk09o.pdfIn PDF document text
    • http://9gusevshop.website/html_responsive_template_generatoreheqd.pdfIn PDF document text
    • http://ita-bio.fun/enteral_parenteral_drug_administrationryd90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369657/normal_6008903e0f2cb.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/jhhjZhf/budopipadesifositam.pdfIn PDF document text
    • http://nout-prokat.website/astrologian_rotation_guidejl6ts.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/cooking_fever_automatic_machine_alpine_meat_palacezh1rh.pdfIn PDF document text
    • http://world-wildshop.com/academic_ielts_writing_practice0g3ms.pdfIn PDF document text
    • http://chelamela.org/mapobosulisesogakibarivh0u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_600e1e61cc2df.pdfIn PDF document text
    • http://jobs-ingenieur.best/fepazumizafug2qpq.pdfIn PDF document text
    • https://dupazenulejafu.weebly.com/uploads/1/3/4/3/134331878/1590828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394061/normal_5ffa6bc86b9ae.pdfIn PDF document text
    • http://macsk.space/390790284931i5o5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 5644 bytes
SHA-256: 75310cab4cfd69a4b8012648d7bf4fba9d48ad6cb15b71ac9630dc6974499736
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 10544 bytes
SHA-256: 2959b663cf6ae7aad4d13e1df1332a7b0718ac68fc5441cf21429bc8a5606675

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