Malicious PDF — malware analysis report

Static analysis result for SHA-256 0848a53eb525591c…

MALICIOUS

PDF

38.2 KB Created: 2020-03-21 16:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 848aba54b00c4f1e27c7adcdf6b69a1c SHA-1: 88d4ae439f51d5af3d9e6cd0d956cd694ad7812b SHA-256: 0848a53eb525591cbc304f0450ec5b97dae874f9c4779bfe5cd7092f743b5160
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains a large number of external links, many of which point to other PDF files. The document body suggests a lure for downloading 'Zte handset usb drivers 5.2', indicating a potential attempt to trick users into downloading malware. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allamericanhandyman.org/uploads/1/3/0/4/130488969/130488969.html#zte+handset+usb+drivers+5.2
    • http://camposdeprovence.com/uploads/1/3/0/7/130738884/1691295.pdf
    • http://saskiavandijk.net/uploads/1/3/0/4/130476632/b6bfc978d496.pdf
    • http://www.mementomoristudio.net/uploads/1/3/0/9/130969851/868412a7fae0d.pdf
    • http://sueheathscience.com/uploads/1/3/0/7/130776113/diwovokewut-puvomin.pdf
    • http://antwerpen-horeca.com/uploads/1/3/0/8/130874567/zofejata.pdf
    • http://daisysdiarys.com/uploads/1/3/0/9/130969850/309a865.pdf
    • http://www.heatllc.net/uploads/1/3/0/3/130313319/sapikupuraboxaked.pdf
    • http://www.dz-spammers.com/uploads/1/3/0/9/130969820/waxeronelotizesezu.pdf
    • http://www.365french.com/uploads/1/3/0/5/130590133/wozeju-jarojobubar-kagefetiguxamig.pdf
    • http://people.ccioh.com/uploads/1/3/0/8/130813557/risinopuwerej.pdf
    • http://mta-sts.mail.fourfoodservice.com/uploads/1/3/0/3/130379075/zixukoki_rezipipa.pdf
    • http://constellateevents.com/uploads/1/3/0/3/130323384/eada12e9e835.pdf
    • http://royalglossbrat.com/uploads/1/3/0/6/130604416/38ebba69fe17.pdf
    • http://pickhk.com/uploads/1/3/0/7/130775792/kaxukilupof.pdf
    • http://hospitalsonespases.info/uploads/1/3/0/5/130590325/795eb4.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_off00006a41.bin
b141e47ca86e0993911e38f3b14e56b617b8391d939c64181ea405513523aef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A41 8356 bytes

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