Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f5a70b6ce8452a…

MALICIOUS

PDF

40.4 KB Created: 2020-03-24 14:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 8dd821846c23551f4caa520f20473996 SHA-1: 3641b73a7faff1d8e83892aa38ab785f531e14cd SHA-256: 20f5a70b6ce8452a54d21c259039555c5af499d567abf7fbba3c49fa7ff870bf
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'common core math standards' and the authoring application 'wkhtmltopdf', suggesting a lure. The primary attack pattern involves directing users to a vast array of linked PDF files hosted on numerous domains, likely for SEO spam or to distribute further malicious content.

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://digitaltacklebox.ca/uploads/1/3/0/6/130605104/130605104.html#common+core+math+standards+california+3rd+grade PDF link annotation
    • http://thebestaddress.org/uploads/1/3/0/5/130539992/1438988.pdfIn PDF document text
    • http://www.anoubong.com/uploads/1/3/0/6/130603808/kuxedu.pdfIn PDF document text
    • http://edhayward.com/uploads/1/3/0/4/130489567/dedukanike.pdfIn PDF document text
    • http://crazymeyerboys.com/uploads/1/3/0/7/130776858/xavadupexinefolififa.pdfIn PDF document text
    • http://www.nannynooeventco.com/uploads/1/3/0/8/130813601/19f8ffbd0.pdfIn PDF document text
    • http://nexoclean.com/uploads/1/3/0/4/130483872/4b77b.pdfIn PDF document text
    • http://xvinvestors.com/uploads/1/3/0/6/130621219/5024315.pdfIn PDF document text
    • http://hackingvirtualization.com/uploads/1/3/0/6/130603782/77cacd4f1692d83.pdfIn PDF document text
    • http://jlm.p-o-n-d.services/uploads/1/3/0/3/130313557/2700802.pdfIn PDF document text
    • http://nuttybeepdx.com/uploads/1/3/0/6/130639397/nuzamidifug-puvilenetoked.pdfIn PDF document text
    • http://ncslibrary.org/uploads/1/3/0/6/130604731/kavabem.pdfIn PDF document text
    • http://zpdevsite.com/uploads/1/3/0/4/130483207/fifidomen.pdfIn PDF document text
    • http://ldnsoccerblog.net/uploads/1/3/1/0/131070364/1222579.pdfIn PDF document text
    • http://elliessexysecretslingerie.com/uploads/1/3/0/4/130436367/jowupaxupoluzofo.pdfIn PDF document text
    • http://coloradocafe.net/uploads/1/3/0/4/130488698/dupumubawavip.pdfIn PDF document text
    • http://www.bellevuedryerrepair.com/uploads/1/3/0/2/130288522/1703223.pdfIn PDF document text
    • http://emiandfriends.com/uploads/1/3/0/5/130588973/1447239.pdfIn PDF document text
    • http://iasodiva.com/uploads/1/3/0/2/130272083/gubewoxulokeraj.pdfIn PDF document text
    • http://jcspencer.us/uploads/1/3/0/6/130603873/70eee96fcd.pdfIn PDF document text
    • http://alnouraldaem.com/uploads/1/3/0/8/130815097/8273853.pdfIn PDF document text
    • http://acuerunners.com/uploads/1/3/0/9/130969051/kavamudasukaw.pdfIn PDF document text
    • http://thosjazz.com/uploads/1/3/0/5/130544385/69fce81d3a47b.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

Related samples 2

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_off000073c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C8 8276 bytes
SHA-256: 9a5fe0b28b7bb81c3b8950fca1f0eec644514ed4b13c54a447e50eed10e00c15

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