Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73cac6b64217da7…

MALICIOUS

PDF

37.4 KB Created: 2020-06-11 23:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 87c5f77017fecb6dada99eec1e6c0f1d SHA-1: fc38ebb12a8b754605f4a79a5768d5abaf218cfe SHA-256: c73cac6b64217da74fb800e7009cf797980f09ccf13e82d029dfc65500080ef8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The primary heuristic identified a "PDF_SEO_LINK_FARM" with 30 links, and an embedded URL points to a tutorial page, suggesting a lure to engage the user with the link farm. No scripts were extracted, limiting further analysis of payload delivery.

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://9f60mcb524.com/uploads/1/3/1/3/131382497/131382497.html#turbocad+designer+tutorial PDF link annotation
    • http://safinanextgen.org/uploads/1/3/1/6/131606592/wezimi.pdfIn PDF document text
    • http://jbuchenic.bucheniclaw.com/uploads/1/3/0/6/130639886/1675081.pdfIn PDF document text
    • http://fireflybellydance.com/uploads/1/3/0/8/130874554/nukunobixidag-ranidudutul-tozoxemi-tagip.pdfIn PDF document text
    • http://mail.smithtaekwondo.com/uploads/1/3/0/6/130621455/babexojak.pdfIn PDF document text
    • http://mx.harpsrv.com/uploads/1/3/0/6/130640092/zaxexizaxosuras.pdfIn PDF document text
    • http://southporttaxi.co.uk/uploads/1/3/0/2/130289765/7163250.pdfIn PDF document text
    • http://cirm-math.info/uploads/1/3/0/6/130639052/2612719.pdfIn PDF document text
    • http://webmail.metricmfg.com/uploads/1/3/1/3/131380531/2551275.pdfIn PDF document text
    • http://hydrolactic.com/uploads/1/3/0/9/130969310/8765757.pdfIn PDF document text
    • http://memoryburncollective.com/uploads/1/3/0/7/130740368/figexetu.pdfIn PDF document text
    • http://sautterfarm4.org/uploads/1/3/0/8/130813988/7382635.pdfIn PDF document text
    • http://morcloud.net/uploads/1/3/1/3/131380505/5797305.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zibidolar.files.wordpress.com/2020/06/78707446805.pdfIn PDF document text
    • https://delerusex.files.wordpress.com/2020/06/92807197007.pdfIn PDF document text
    • https://suvasebe.files.wordpress.com/2020/06/zidorelowizakopafe.pdfIn PDF document text
    • https://jorajeto.files.wordpress.com/2020/06/xoxarapejiseseluvajiwus.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_off00006639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6639 10432 bytes
SHA-256: 19e8f7ebc13739a41a971ad4f436c4870c9ae34a42a7478b9c6dbbb1c8c14e54

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