Malicious PDF — malware analysis report

Static analysis result for SHA-256 809b7ca81cff4c4d…

MALICIOUS

PDF

48.2 KB Created: 2020-04-10 03:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 1528e97cb86966d9527c609e6f9f5196 SHA-1: 5b74d3602506a956de89afc2e0b2a4563c2b2c07 SHA-256: 809b7ca81cff4c4d5916cd5a0df6ef3fb6bfa120c4c0dd1b33ddc6b1ddd88840
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a method to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to direct users to potentially harmful content, possibly as part of a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://euvat.solutions/uploads/1/3/0/5/130550986/130550986.html#derecho+privado+internacional+colombia PDF link annotation
    • http://margyparker.com/uploads/1/3/1/3/131381721/3339857.pdfIn PDF document text
    • http://calfirepro.org/uploads/1/3/1/3/131379586/7979508.pdfIn PDF document text
    • http://starkeyhomes.net/uploads/1/3/0/8/130813132/7657461.pdfIn PDF document text
    • http://bornincolumbus.com/uploads/1/3/0/2/130289220/wulan-filuboj-kulopazuze-womekawi.pdfIn PDF document text
    • http://thalermontage.ch/uploads/1/3/0/8/130874408/rogixiwopepilosa.pdfIn PDF document text
    • http://thisnthatcraftmill.net/uploads/1/3/0/8/130813612/2964fbfeef.pdfIn PDF document text
    • http://betaniadigiannagelfusa.org/uploads/1/3/0/5/130548152/81f8505.pdfIn PDF document text
    • http://chelseateeth.com/uploads/1/3/0/5/130588885/c02517c250db3fe.pdfIn PDF document text
    • http://heightsallhomeservice.com/uploads/1/3/0/3/130313410/f4104b.pdfIn PDF document text
    • http://amber-leighorth.com/uploads/1/3/1/3/131380618/3b9ec7e.pdfIn PDF document text
    • http://freshpaws.pet/uploads/1/3/0/6/130622092/2396770.pdfIn PDF document text
    • http://tipsymarlinfloatingislandpr.com/uploads/1/3/1/3/131384611/vapiperu_nobugokitum_tewurivijudav.pdfIn PDF document text
    • http://ocele.org/uploads/1/3/0/7/130775627/vafekino_numolarebo_ririvodomugud.pdfIn PDF document text
    • http://wirlwiz.com/uploads/1/3/0/3/130313203/7814372.pdfIn PDF document text
    • http://wellsmerefarm.com/uploads/1/3/0/5/130588594/revasaxasiwupepir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off00007395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7395 8576 bytes
SHA-256: fd96371373f6355ce1061b4b98e06d00d8aecd71bbf3a2dc26f23b7e41339a6e
font_01_sfnt_off000092f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F8 2652 bytes
SHA-256: e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
font_02_sfnt_off00009c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5F 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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