Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d3ed620d2ef3b7…

MALICIOUS

PDF

71.1 KB Created: 2021-03-06 16:23:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4d5e8c331f902af47d82f225f30fe5f SHA-1: 75f51f276c8b3871e111168236f53cdf436a178f SHA-256: 80d3ed620d2ef3b70cbd0d22d53998ff908b3e15bbf5582f62d9816af0fe79a8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are likely part of an SEO link farm designed to artificially boost search engine rankings. The document body, though heavily obfuscated, contains keywords related to 'immigration worksheets 2nd grade', suggesting a lure to attract traffic to these linked sites. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent related to link manipulation and potentially hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://leonvi.ru/wix?keyword=immigration+worksheets+2nd+grade
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/bokipipenezik-xibasuzilosura.pdf
    • http://springwin.space/car_service_schedule_templateg2trl.pdf
    • https://mifopezuzata.weebly.com/uploads/1/3/4/4/134484464/e58c5.pdf
    • http://ersoil.fun/305576270946dyjo.pdf
    • http://losqutoq.online/fokupomovenevepxn5yr.pdf
    • http://dronextactical.xyz/what_is_the_age_of_reason_in_the_biblel3g05.pdf
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/b83bf272121.pdf
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/1109750.pdf
    • https://sumiloruxefeme.weebly.com/uploads/1/3/2/8/132814276/xevunu-nazujabopawis.pdf
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/sovibog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d8dcfd6-37a7-4551-9c5b-20c12c4ad9b6/dudesaxazijiganojeluw.pdf
    • http://fopupasefe.rf.gd/captiveaire_a2-_d._250-_g15_manual.pdf
    • https://uploads.strikinglycdn.com/files/25f72fb4-9f40-4d42-9738-60cd0d25a1f0/13759697320.pdf
    • https://uploads.strikinglycdn.com/files/62cf9609-25a9-45e2-89b5-cf5d66569b24/72611760913.pdf
    • http://serinuzosazojup.epizy.com/samsung_un60j6200af_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/13459c1c-2357-47cf-a954-d3a796db9103/necromunda_underhive_wars_tutorial.pdf
    • http://kivosokefenugez.epizy.com/clinical_pharmacology_definition_in_medical.pdf
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_356395b2ed44489c8494751835bdff3e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/71a9ae8a-06c4-4a3a-bb28-ef342c805d27/74567147348.pdf
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_da8ba6a57df74d248f317689db23b106.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d872.bin
a60a791ba3875ffc9a8d2a9b244da40fd1a594db0df39f8fe14a315f924dfe7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 5432 bytes
font_01_sfnt_off0000ead7.bin
90f66d6dde056ed5b8cab8943b7ca3deb05f824a686bed1aa03c9d6c836b3084		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 10676 bytes

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