Malicious PDF — malware analysis report

Static analysis result for SHA-256 efafcee8c30e1fc4…

MALICIOUS

PDF

77.4 KB Created: 2021-02-16 06:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6637f123762f3525898bae1e997b518c SHA-1: eb27fc99aca1e9c70c236dd5eae2ec439ae2eefd SHA-256: efafcee8c30e1fc42d36239426716cb290601c08921ee3488235cce7c2f6249d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.
  • 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://crophysi.ru/123?utm_term=health+information+technology+degree+jobs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fedf4ce011e5.pdfIn PDF document text
    • http://worldthailand.fun/23591417661ep9xb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fc90b100f39b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5ff60e1dee542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406516/normal_5fed9839e2791.pdfIn PDF document text
    • http://mexicotop3.xyz/atya_patya_rulesi0eld.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443344/normal_60036f71a6b06.pdfIn PDF document text
    • http://reduslim-shop.site/archipelago_tour_with_guide_stockholm3btfz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_6020719a872fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497356/normal_5fcf24df6e062.pdfIn PDF document text
    • https://talekadibozevo.weebly.com/uploads/1/3/5/3/135393667/jonevuz-varutisur-vixoxulad.pdfIn PDF document text
    • https://rodagekutav.weebly.com/uploads/1/3/5/3/135313742/zedovimamerezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_6016021ae365a.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/wuzalugiseto/bescherelle_vocabulaire.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/56288830500.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_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 5712 bytes
SHA-256: 37813138744dfbc84a95e7ff8a2e3cbebc5a05e685b14d7e16f9aa98101b2cbb
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 10164 bytes
SHA-256: f82a4949e30111fadd3ccbf70ea07b001acde413931b9f842cbc11564dd9bc03

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