Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc8424e113fa4b4…

MALICIOUS

PDF

76.3 KB Created: 2021-01-30 15:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fa644386db44f666c820a4187f509805 SHA-1: 66ad58d23eda29d66fada76afba552eed759c80c SHA-256: 6dc8424e113fa4b4bc994767cae4e056c5d92a3ae5271307576def366a76c636
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs hosted on Weebly and other platforms, indicative of a link farm or redirection scheme. The presence of a 'password manager' keyword in one of the URLs suggests a phishing or credential harvesting attempt. ClamAV detection and ML classification further support its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/wb?keyword=password%20manager%20password%20cloud%20pro%20apk PDF link annotation
    • https://kixixowagixu.weebly.com/uploads/1/3/2/7/132710794/121eb0efb281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451353/normal_5fe158163a72d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5ffe124198bbf.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/45f3aeea9e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_6013e4680f59a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369496/normal_5fc9f1e865e1b.pdfIn PDF document text
    • http://tushkanok.xyz/best_flute_remix_ringtone_2020p4r2p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_60045b83a4e15.pdfIn PDF document text
    • http://delifeschool.com/controle_maths_5eme_proportionnalit89z4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_60122ef2c54f2.pdfIn PDF document text
    • http://phrensy.co/32992591299snpxq.pdfIn PDF document text
    • http://byseles.xyz/8465199123nunhy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://golujaxi.epizy.com/lagu_batak_simalungun_terbaru.pdfIn PDF document text
    • http://bitumexupun.epizy.com/mukejujezepudepenixuw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 5548 bytes
SHA-256: e386efa1c70272758b64bdb8194e01a7094b0905431a9111de406d3cff15b786
font_01_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 10260 bytes
SHA-256: 7c5d32b1195c201c1b3fda34268bd297c06068f0b50c42da25831bcbf6f68802
font_02_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 16068 bytes
SHA-256: 12bdfdd26b42687ed6d6e4673084773943fc64d80ea302008a05158b1f99f3df

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