Malicious PDF — malware analysis report

Static analysis result for SHA-256 5312655d09f6de58…

MALICIOUS

PDF

37.8 KB Created: 2020-06-05 21:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 6334f3495be1de22851c22531d96e55c SHA-1: 74db45e160e98169e00320bedbf14ee4e32a6038 SHA-256: 5312655d09f6de58c682dfc48389ba2db468d66d0aedb93b4e640ee22f05e022
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This indicates a link farm strategy, likely intended to distribute malicious content or engage in SEO manipulation for phishing. The document body text, while containing a plausible lure related to accountancy studies, is heavily obfuscated and appears to be a byproduct of the PDF generation process rather than user-facing content. The primary attack pattern observed is the distribution of numerous potentially malicious PDF files via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nellbeckerman.com/uploads/1/3/0/5/130588710/130588710.html#an+aid+to+accountancy+class+12+2019+pdf+download PDF link annotation
    • http://29bhsbunkhouse.net/uploads/1/3/0/7/130776247/kelibopuba-nurelawer-dozurodone.pdfIn PDF document text
    • http://kayleenartistry.com/uploads/1/3/0/6/130621477/jarajimizatix.pdfIn PDF document text
    • http://savannahbackwatercharters.com/uploads/1/3/0/2/130291531/getupowojobet_rowox_momozakig.pdfIn PDF document text
    • http://mail.villagegreenla.net/uploads/1/3/0/4/130477064/7221424.pdfIn PDF document text
    • http://xn--tegnplring-55an.dk/uploads/1/3/0/6/130639827/buwofim_metila.pdfIn PDF document text
    • http://kristenbarneslcsw.com/uploads/1/3/0/6/130640178/f666f24.pdfIn PDF document text
    • http://gablehorse.net/uploads/1/3/1/8/131857602/bba1d4161.pdfIn PDF document text
    • http://sgreptilesandaquatics.com/uploads/1/3/1/4/131409508/4834727.pdfIn PDF document text
    • http://mta-sts.mail.metalock-international.com/uploads/1/3/0/6/130621988/gigaj_tazaxafebozapox.pdfIn PDF document text
    • http://nellbeckerman.com/uploads/1/3/0/5/130588710/terms.htmlIn PDF document text
    • http://nellbeckerman.com/uploads/1/3/0/5/130588710/dmca.htmlIn PDF document text
    • http://nellbeckerman.com/uploads/1/3/0/5/130588710/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://badodisorel.files.wordpress.com/2020/06/nemepivuxelaxevimul.pdfIn PDF document text
    • https://tofogaba.files.wordpress.com/2020/06/78352440871.pdfIn PDF document text
    • https://rokokexer.files.wordpress.com/2020/06/pisibegodeluzejuxeguwu.pdfIn PDF document text
    • https://jerivari.files.wordpress.com/2020/06/jeresor.pdfIn PDF document text
    • https://gavilot137689634.files.wordpress.com/2020/06/rivozizumagagufivo.pdfIn PDF document text
    • https://zogubaj.files.wordpress.com/2020/06/98031211185.pdfIn PDF document text
    • https://vexufodobek.files.wordpress.com/2020/06/gigowesarabarulekop.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 4

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D3 10404 bytes
SHA-256: 931454552e360535118fea47c3df677132b37ddc791d0476b2ccb5889ad8967b

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