Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6deee6f03e12c88…

MALICIOUS

PDF

81.6 KB Created: 2021-03-15 15:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 862508361965180ff985578b88ac0f11 SHA-1: c506521879d32868b22a165223d17246a94bc972 SHA-256: a6deee6f03e12c88c53af1bf3d7815aa35f46ca67064dc2725900e0bbfb165e1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The embedded URL 'https://nipisod.ru/wix?keyword=emp+jammer+app' is flagged as unknown reputation, suggesting a potential malicious destination. While no scripts were directly extracted, the PDF structure and link farm indicate a likely attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/wix?keyword=emp+jammer+app PDF link annotation
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/8991506.pdfIn PDF document text
    • http://leledup.mypressonline.com/41037911922.pdfIn PDF document text
    • https://lamonide.weebly.com/uploads/1/3/4/0/134096931/2221185.pdfIn PDF document text
    • http://fejugutafilevin.scienceontheweb.net/navigators_topical_memory_system.pdfIn PDF document text
    • https://finirawex.weebly.com/uploads/1/3/2/7/132741073/sekolubo.pdfIn PDF document text
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/cfc15be685b70b.pdfIn PDF document text
    • https://merugerizun.weebly.com/uploads/1/3/4/3/134337850/3764601.pdfIn PDF document text
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/1388841.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/fadina-lukegudixatusi.pdfIn PDF document text
    • http://dibiwarisogix.mygamesonline.org/bearing_types_and_numbering_system.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/2967087.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/dos_command_examples_batch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jezobasit/mass_effect_andromeda_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/best_multiplayer_android_games_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/blocks_game_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/noxelorolegovexepamovum.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/avaya_one_x_communicator_install_switches.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/budamixiba.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/what_age_to_use_uppababy_rumble_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/nojegokipegogifumiserimev.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/37046519015.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/why_is_my_spray_paint_spitting.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 4788 bytes
SHA-256: ff0430005f4eed6375b8a2d30f198c4a1c50960b97a3a2c3c7e875904bc48428
font_02_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 14052 bytes
SHA-256: ef025bfc7fd7a6d64906c842fe9fad36a1bffbef17876feff681da23f9ca48db
font_03_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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