Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b2a48e4fa36fda…

MALICIOUS

PDF

42.5 KB Created: 2020-03-16 00:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5cccb8e9b95b98f02f09ae726a9828c6 SHA-1: 1b165a6a00be45057cd2415092d8a37c4372e744 SHA-256: 70b2a48e4fa36fda91d64925d6922faa43561a3a0e8dd21301ebc1030bccdf62
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of embedded external links to other PDF files hosted across numerous domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict, and the heuristic firings confirm the presence of a mass external link farm.

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://0r8pu.salon225.com/uploads/1/3/0/7/130739128/130739128.html#letter+l+alphabet+worksheets
    • http://yesfounders.de/uploads/1/3/0/7/130775277/82f1c9aa487f8.pdf
    • http://www.pickawaycountyhelpmegrow.com/uploads/1/3/0/9/130969030/tetavavikelonixu.pdf
    • http://oslorelocation.org/uploads/1/3/0/5/130588185/xerupe.pdf
    • http://oakbendcommons.com/uploads/1/3/0/6/130639910/b630b.pdf
    • http://baseconscio.us/uploads/1/3/0/5/130589057/0bf3bf78f7d48.pdf
    • http://biscuiteering.com/uploads/1/3/0/5/130539315/lalavila.pdf
    • http://www.portfoliolaura.com/uploads/1/3/0/4/130476318/3046998.pdf
    • http://www.thefaithfulstamper.com/uploads/1/3/0/7/130776366/885b14.pdf
    • http://www.borealistime.com/uploads/1/3/0/7/130740496/cca2224.pdf
    • http://acfitness.co.uk/uploads/1/3/0/4/130475984/e00dc018.pdf
    • http://automobiliabybuck.com/uploads/1/3/0/3/130312998/dadukapofafuromup.pdf
    • http://wp.musicatozpodcast.com/uploads/1/3/0/8/130874210/fuwezujexene.pdf
    • http://chatsaubain.be/uploads/1/3/0/3/130379362/fuwujimobeti_mosajemirokef.pdf
    • http://requiroimports.com/uploads/1/3/0/5/130543084/biwesoj.pdf
    • http://embroideryforfun.com/uploads/1/3/0/3/130379292/wilabatubozat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bbd.bin
480d53650f94c416748fa997af38f0eb215c9de46adf1df15be459fa64e05061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBD 8252 bytes

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