Malicious PDF — malware analysis report

Static analysis result for SHA-256 18311dbee7480087…

MALICIOUS

PDF

64.4 KB Created: 2021-02-24 12:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 81574a2f966ccfe82bc2d55a169e0192 SHA-1: 3ffb8d72b9a3f250dad510645c1139f2b8491f68 SHA-256: 18311dbee74800874902aa405603a3ca67c3cbec202a83740214f4672a96ecc7
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, and is described as a link farm for 'getjar apk download apkpure'. This suggests the primary goal is to redirect users to potentially malicious websites for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt.

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://bologen.ru/wix?keyword=getjar+apk+download+apkpure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420039/normal_5fe9b925e3397.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/yqjj4gc/recharge_ntc_nepal_online.pdfIn PDF document text
    • http://pixelbarista.com/xilevakezepovosusuwajedenr6jv.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/iaNaifG/47939373231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_6031e2ef7d27e.pdfIn PDF document text
    • https://litazotivov.weebly.com/uploads/1/3/0/7/130740097/5461a3b40fdf5.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/dasamevot8ini.pdfIn PDF document text
    • http://dronextactical.xyz/schedule_maker_templates_free_excelwxcf3.pdfIn PDF document text
    • http://ig-socialmedia.xyz/vafenakogeptee5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_6021c18b79faf.pdfIn PDF document text
    • http://espaceclient-cmb.com/77450874339nqxze.pdfIn PDF document text
    • http://devlp.design/termination_of_lease_agreement_template_south_africa14cue.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/neporezofov/autocad_2009_free_softonic.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_off0000c145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC145 5040 bytes
SHA-256: 69139b58eb8a555170f4f666c6ac9b028431005645f8128d68b20f273785fb86
font_01_sfnt_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 10016 bytes
SHA-256: 2a93d3219e9669c54d07d72ef80b23258c4a78a2148a89b01b0ffaaad9a5a2ba

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