Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c0b7885ba830d2…

MALICIOUS

PDF

73.2 KB Created: 2020-03-30 02:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 93c2603fea85c7b0a18ea5d81958e4b9 SHA-1: 3f4606afd615f42059c01187daa0476275a3d83f SHA-256: b5c0b7885ba830d2da26baf684d1d56fd2d5fa47ce8a1922b7a2f2baeeda8244
96 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution network. The document body contains a title related to learning theories, which is likely a lure to disguise the malicious intent of the link farm. No scripts were extracted from this sample.

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://nursingarmpillow.com/uploads/1/3/0/7/130775515/130775515.html#teorias+contemporaneas+del+aprendizaje+resumen PDF link annotation
    • http://performanceinspired.com/uploads/1/3/0/8/130813897/vopokajom_vupif.pdfIn PDF document text
    • http://tiggyz.net/uploads/1/3/0/3/130323542/e01b6eb92e37e7.pdfIn PDF document text
    • http://1920blaq.com/uploads/1/3/0/5/130550915/2617ad7ff5fb6ea.pdfIn PDF document text
    • http://bribieislandpopupweddings.com/uploads/1/3/0/5/130590296/1ecca93658.pdfIn PDF document text
    • http://jomccaffertyproperties.com/uploads/1/3/0/6/130639462/4b654da0f.pdfIn PDF document text
    • http://deluxe-autoglass.com/uploads/1/3/0/7/130739185/2329383.pdfIn PDF document text
    • http://eastcoastnpl.org/uploads/1/3/0/6/130621082/cb8ab.pdfIn PDF document text
    • http://kansaswoundedvetrun.com/uploads/1/3/0/2/130288579/medokorexazup.pdfIn PDF document text
    • http://nrsmallgroups.com/uploads/1/3/0/9/130969402/jivuf.pdfIn PDF document text
    • http://blazarfounders.com/uploads/1/3/0/6/130621867/e06940e5a528d.pdfIn PDF document text
    • http://yukonenvirothon.com/uploads/1/3/0/5/130588810/1882827.pdfIn PDF document text
    • http://scoopsandkettle.com/uploads/1/3/0/5/130588686/9199956.pdfIn PDF document text
    • http://thejackquest.com/uploads/1/3/0/7/130739053/fisefowiwitore.pdfIn PDF document text
    • http://bluestone406.com/uploads/1/3/0/6/130621152/3171df7f.pdfIn PDF document text
    • http://henriksenauto-body.com/uploads/1/3/1/4/131406687/zebaneragerubewene.pdfIn PDF document text
    • http://emilycoatesdoulaservices.com/uploads/1/3/0/8/130813798/80533b3e1db0.pdfIn PDF document text
    • http://buttonsandbowsltd.com/uploads/1/3/0/2/130288637/sobidugupote_lavifi_zaduketan_zawog.pdfIn PDF document text
    • http://shubert-ticketing.com/uploads/1/3/0/5/130550937/zojiro-bafewodejox-bimegiwenine.pdfIn PDF document text
    • http://projectilemedia.org/uploads/1/3/1/3/131384336/poxutepi.pdfIn PDF document text
    • http://stephenaschmidtllc.com/uploads/1/3/0/6/130605216/7438758.pdfIn PDF document text
    • http://neverthelessshecomposed.org/uploads/1/3/0/6/130604564/fc9661470.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 1

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_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 9732 bytes
SHA-256: f8549193ec276511e8ae6c57839c283927dabced53a4c75ce23b3cab76e3f75e

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