Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11b40bea182b00b…

MALICIOUS

PDF

76.4 KB Created: 2021-05-18 08:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe12282e521fe57b8cbebcef570db4bc SHA-1: 1ad7a1095e3be79a773fb209dff3a7314d96ba5e SHA-256: a11b40bea182b00b9aded4ee33301bb8097fbade0b3c665dc1e056a99bc30265
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files, suggesting a link farm or content distribution network. The primary URL, 'https://baarspo.ru/wb?keyword=real%20book%201%20indexes', indicates a lure to a search result page. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wb?keyword=real%20book%201%20indexes
    • https://gerapulopenun.weebly.com/uploads/1/3/4/5/134587141/gevutavududoma.pdf
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/vuvizawa.pdf
    • http://vosusapar.22web.org/descent_of_man_tc_boyle.pdf
    • http://vasuxarogaxatix.iblogger.org/xilolulepaxogomuba.pdf
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/dokezusinezuxuv.pdf
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/lijexegoridiba_tinipexu_rozonuvuvajupab_moxusexa.pdf
    • https://zamigalimigarub.weebly.com/uploads/1/3/5/3/135326483/4868435.pdf
    • https://rulovuwupe.weebly.com/uploads/1/3/5/3/135386045/puzaresuxowesov-magivosarukojap-suzilofi.pdf
    • https://xanevifoje.weebly.com/uploads/1/3/4/6/134666083/8573722.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mukut/chrome_android_move_address_bar_to_top.pdf
    • https://uploads.strikinglycdn.com/files/0591b7f1-f208-416c-a752-a0c6740ebed8/download_english_to_swahili_dictionary_offline.pdf
    • https://s3.amazonaws.com/xovajukoxin/properties_of_exponents_worksheet_algebra_1_answers.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/oscar_awards_2017_winners_list_file.pdf
    • https://s3.amazonaws.com/wegemebufojafak/alone_together_escape_room_clock.pdf
    • https://uploads.strikinglycdn.com/files/866eddd9-1935-49b6-8977-f39a4f965ebc/how_to_install_ink_cartridge_hp_deskjet_1512.pdf
    • https://uploads.strikinglycdn.com/files/e182e0b6-065a-4f67-b9a7-5e209bd3b2d2/81026749943.pdf
    • https://uploads.strikinglycdn.com/files/3ce2fa04-6906-4f44-9a1c-4005c3efd1f3/basic_english_book_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/b662247c-d508-4e20-a9bf-2750dfe6d96b/speak_by_laurie_halse_anderson_essay.pdf
    • https://s3.amazonaws.com/vifusupegiza/como_debe_ser_un_lider_segun_la_biblia.pdf
    • https://s3.amazonaws.com/gewuwasi/xoxogas.pdf
    • https://s3.amazonaws.com/tanapilamaxi/childrens_tamil_story_video_free_download.pdf
    • https://s3.amazonaws.com/nilititonawafim/11922227609.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef9.bin
8fd870d81eb1764845d9258dc916bb6b88a1b21b379dab4ef7dfe75b399a360b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 5056 bytes
font_01_sfnt_off00010043.bin
c74bd90e6ffad5137f6a1bd8fff5f61243bf35f3d9850d0cad827c9ae57cc850		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 10508 bytes

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