Malicious PDF — malware analysis report

Static analysis result for SHA-256 684b7eb2437a188a…

MALICIOUS

PDF

81.9 KB Created: 2021-01-05 07:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f88a4b03c73db719cdcaa0fed3905ece SHA-1: c13408106babe53fdb2bf02f109c9f925ef231fa SHA-256: 684b7eb2437a188a1be45a65412f7554230169921763958007749ba183e2c5c9
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/123?utm_term=yugioh+forbidden+memories+2+psx+emulator+cheats PDF link annotation
    • https://gitiritibew.weebly.com/uploads/1/3/1/4/131483488/loziroja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5fc035526e9b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5f9fdb5c473b1.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/03881f00bd5a9ef.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/634a4d84c4a9b.pdfIn PDF document text
    • https://cdn.sqhk.co/bulamije/zIidCM2/xotipaxiliturelu.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/vikuwoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_5fd91dd2e2d88.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/kimghKK/pulling_usa_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427501/normal_5fc85013761db.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/7040181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5fe32ff8da642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8a60b54b8e7.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/8745836.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/24afe0a4-63f5-4be3-baa0-ae34655acca8/46902737426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54727061-1897-4b04-9a7a-d08da32af6ca/acnl_april_fools_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 5872 bytes
SHA-256: e45cba0afa78a10aae21de044a0ee8c17bb0d439515d714f699184b650d0402f
font_01_sfnt_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 12376 bytes
SHA-256: da5fb167b8a1d97c89d82e7743f46d684822a2eca3d7caa0da136c191a962a65

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