Malicious PDF — malware analysis report

Static analysis result for SHA-256 15028a6f4e255df2…

MALICIOUS

PDF

39.0 KB Created: 2020-03-29 07:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7064a5bbfbec9483fd9baaa3d5ac3634 SHA-1: 73fddfe85ef3c1ff7d894c326735f6d8d93a3da4 SHA-256: 15028a6f4e255df2f97be1239b5ec700bfb8fb2fde384b86abf25f8fc04ce1ad
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, many of which point to other PDF files. This pattern is indicative of a link farm or a mechanism to distribute additional malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body is heavily obfuscated, but the sheer volume of external links is the primary indicator of malicious activity.

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://tcsonline.net/uploads/1/3/1/1/131163718/131163718.html#caracteristicas+sistema+de+inventario+periodico
    • http://bergcopy.com/uploads/1/3/0/5/130550812/rufudip.pdf
    • http://samanthayerkspsychotherapy.com/uploads/1/3/0/5/130588789/widirugeteb.pdf
    • http://sakuradelectables.com/uploads/1/3/0/4/130489563/merelolobetuvaxon.pdf
    • http://inkbybeth.com/uploads/1/3/0/5/130543568/ca6663b4bb.pdf
    • http://warehouse16fitness.com/uploads/1/3/0/6/130639145/8516892.pdf
    • http://chrisiesconfections.com/uploads/1/3/0/4/130483866/ruzenojixosi.pdf
    • http://naturalbeautybynature.com/uploads/1/3/0/2/130289632/4b7b152.pdf
    • http://armdancermedicalcenter.com/uploads/1/3/1/1/131164039/lavenajidoxen.pdf
    • http://thebibleclicks.com/uploads/1/3/0/2/130274145/914740.pdf
    • http://acrespain.com/uploads/1/3/0/7/130775710/21850a.pdf
    • http://ogilvyforsvb.com/uploads/1/3/0/9/130969475/b8b3821b6.pdf
    • http://www.voodoohk.com/uploads/1/3/0/4/130476079/rusadifigikeb.pdf
    • http://trueyouarttherapy.com/uploads/1/3/1/0/131070006/34c417a16d4754f.pdf
    • http://londonbombsites.com/uploads/1/3/0/3/130323471/jiwan_ligaros_zuzibi.pdf
    • http://kamran1040.net/uploads/1/3/0/9/130969362/gifesisar_dodabezi.pdf
    • http://takebacktheknight.com/uploads/1/3/0/4/130476390/gupula.pdf
    • http://inspirationsonglass.com/uploads/1/3/0/2/130289305/zevitebob-fufidupozekize.pdf
    • http://mta-sts.homesome.co.za/uploads/1/3/0/8/130873922/5555065.pdf
    • http://cordofcallowsdocumentaryfilm.com/uploads/1/3/0/6/130604016/gejonaded.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_off00006f0c.bin
f33c464c85194a08f081903d7662b62817e47beac61a2a37481e1c837db906f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0C 8584 bytes

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