Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a183a804b35299…

MALICIOUS

PDF

87.4 KB Created: 2021-03-06 14:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 85fa81b00d0fde2535a74a872928caec SHA-1: c914e71f026807737fdc47600f6aea84bf40cf07 SHA-256: a1a183a804b352993b0be9ef7667c52426da4e2fe1121e28749642f6a4cdcc8e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and a document body that attempts to trick the user into clicking a link related to changing tablet settings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics further support this, suggesting the PDF acts as a dropper for malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://resalured.ru/123?utm_term=how+to+change+time+on+my+acer+tablet PDF link annotation
    • http://gromstroy.com/burugimasizunaruz8.pdfIn PDF document text
    • http://zimipodetasasa.iblogger.org/icd_9_code_for_staphylococcal_infection_unspecified.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420438/normal_60377c8649bb4.pdfIn PDF document text
    • http://muvibigi.22web.org/gemini_alarm_system_low_battery_e02-00_service.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374024/normal_6002e55c1a797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5ff82a34d1d3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419193/normal_5feefd9bdfe24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_6009d73a8e4ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412890/normal_60008ef8981d1.pdfIn PDF document text
    • http://todayit.pro/magic_chef_bread_maker_cbm_310_manualmu51c.pdfIn PDF document text
    • http://erethiztzj.space/zekesegiliwawof3shbj.pdfIn PDF document text
    • http://reassurez-moi-fr.info/10848946376bex47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5fcec1a70c0e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_b8c35aba24094cc883ec87e00b5964e8.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_13a8dbd71ea5493eaba965d3fa6372f3.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_838dfc2108bf4d278b01bd8771efcd97.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_94140a54b5d642f48311d01d74517dee.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 5332 bytes
SHA-256: 4a556de38c41dc6dac185097ccd079989fc4979eddf87664560a654a63efdde0
font_01_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 12700 bytes
SHA-256: e221ced346bad1e05a973e5954540ddb6b5811376651ceb53f57a320e292f65b
font_02_sfnt_off00013b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5B 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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