Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1df1b630fc92800…

MALICIOUS

PDF

80.7 KB Created: 2021-02-25 08:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 70b9f740edbba3b7ddc4be5eec88085a SHA-1: d515600ecf888f65c399b0637452360b64702a7b SHA-256: a1df1b630fc92800197979d7316b0cce0a743bc89f2739ced2e4637c8cc1fdd9
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI and an image lure that redirects to the URL https://jacksth.ru/123?utm_term=how+to+make+a+simple+dimple+out+of+paper. This URL is likely used for phishing or to download a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/123?utm_term=how+to+make+a+simple+dimple+out+of+paper PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459805/normal_6036a236f0aa9.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/fiajfgd/zalomasizajimufuveko.pdfIn PDF document text
    • http://vk-settings-change.online/2833491197vbzp4.pdfIn PDF document text
    • http://taptopbot.com/20464727399615xg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5fcacc8c6d052.pdfIn PDF document text
    • http://top-agent.ru/fixodasuxateximuvozivu1tbdu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5ff59c601dd4a.pdfIn PDF document text
    • http://auto-fishing-rods1.club/how_to_share_a_post_from_someone_else_on_facebook43g3b.pdfIn PDF document text
    • http://maska-respirator.shop/punowevevewfeyxw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447450/normal_60013db0e2235.pdfIn PDF document text
    • http://magatapomuv.22web.org/wonojez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392656/normal_5fccd9c7470a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fdff37fafb9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_5fdb16b0b99b3.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/online_to_autocad_dwg_converter0uauk.pdfIn PDF document text
    • http://im-marceting.site/52425057378u7u96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fe4b9eb94f82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kifobidurusidi.epizy.com/55090435845.pdfIn PDF document text
    • http://wiwekire.epizy.com/81476087184.pdfIn PDF document text
    • http://pizubape.rf.gd/82514593205.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 5080 bytes
SHA-256: e5fbd68311db0e335395ad3f898236ab41e3b95009ae3b7bf578d9977191c1c1
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 10552 bytes
SHA-256: d6a73fbdbaff5439f161e924c2a789b69c283eea9a70915c5102e00bf52f293e
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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