Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7616c29bfe2fb1…

MALICIOUS

PDF

82.9 KB Created: 2021-02-05 11:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9f376836d3c08bfddb50ded369aaa460 SHA-1: 0182beb64be4acf43363ac35cdda1d4a9f4250a0 SHA-256: 1e7616c29bfe2fb1e06879260b32a9d453ad72d528b6dd8b3a0eab226e64d26e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=fermentation+and+distillation+lab+answers PDF link annotation
    • https://cdn.sqhk.co/kekelivig/hVjjSgj/playbox_apk_download_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd642ab7fcf4.pdfIn PDF document text
    • http://noxesim.iblogger.org/botadunatizerogub.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/Jicgihd/51953123062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5fd26a8bc026d.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/Hgcjeqm/hepatomalacia_medical_dictionary.pdfIn PDF document text
    • http://morikulifitoj.22web.org/psd_file_tri_fold_brochure_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_600e7b0648f86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixobijuruloluk.rf.gd/block_google_ads_on_android_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/78313776918.pdfIn PDF document text
    • http://moxododokojuke.epizy.com/9066238801.pdfIn PDF document text
    • http://xusoloturokuk.epizy.com/73942936230.pdfIn PDF document text
    • http://pikawin.rf.gd/37153146172.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_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 5160 bytes
SHA-256: beb248ed4d296737939b96bd4b1052e0c129b065f199ca7dae454560338fd1a8
font_01_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 12656 bytes
SHA-256: 2a2e16b82e11950b3a2e1b451965d0cf648cd0e337f47cca2a34ab8adb7c1bae

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