Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9811bdf695b1bc8…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 08:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 047d23e2cda4668b47bfd016425a1507 SHA-1: b96b3da1ee61d750caf62a47f69b009d36913a0b SHA-256: a9811bdf695b1bc88a624be495bd5f8e6533d4a78d88ac7d1deb17f96f28e4aa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with one pointing to a suspicious URL (https://pelibifir.ru/123?utm_term=2019+calendar+template+with+holidays+pdf), likely used for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/123?utm_term=2019+calendar+template+with+holidays+pdf
    • https://cdn.sqhk.co/fuzokikili/V9hhGgj/halogen_displacement_reactions_worksheet.pdf
    • https://cdn.sqhk.co/judigirowe/caghbfN/stickman_archer_2_free_online.pdf
    • http://xajuguzim.iblogger.org/41260114115.pdf
    • https://cdn.sqhk.co/pevizopubok/fSchfJG/fikuwujigewu.pdf
    • http://nuzovofevaduw.22web.org/hossana_marcos_barrientos_tab_guitarra.pdf
    • https://cdn.sqhk.co/wupefukawis/iftnRtd/fivewoxopa.pdf
    • http://kolejuf.iblogger.org/crystalline_silica_health_monitoring_guide.pdf
    • https://cdn.sqhk.co/towevefizub/chh7pib/furreal_friends_gogo_my_walkin_pup_instruction_manual.pdf
    • https://cdn.sqhk.co/tokarikadez/jiD3khh/executive_personal_assistant_jobs_los_angeles.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3f12e06c-791b-4db0-9400-d9bc58de0356/amazon_echo_dot_user_guide_uk.pdf
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_59371255a59e42a397bb48f8ff688e63.pdf?index=true
    • https://uploads.strikinglycdn.com/files/610e19ca-5d99-453f-a96c-2cfac8f59ef0/nonekel.pdf
    • https://uploads.strikinglycdn.com/files/fed1b55a-e2d1-4723-9d7c-846edb69d9a9/what_is_opposite_of_critical_thinking.pdf
    • https://uploads.strikinglycdn.com/files/6b0fd640-6012-4e11-9cae-f15c76027534/xutogujidokokufafuvumev.pdf
    • https://3a988cde-8684-4da7-9cc5-a1c078ef4475.filesusr.com/ugd/1f7474_0f0495f27fe6458499759388235eb676.pdf?index=true
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_83c4ebfe148d44dcbd032ece10ff6b98.pdf?index=true
    • http://vafikozokus.rf.gd/1995_polaris_425_magnum_specs.pdf
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_03ec79a945af4ff797aa2f3c9f9597f6.pdf?index=true
    • http://sipopos.epizy.com/how_to_make_a_diy_humidor.pdf
    • https://uploads.strikinglycdn.com/files/f3e5fbd9-297f-42af-906f-9df0cf03e0c8/process_dynamics_and_control_4th_edition_solution_manual_download.pdf
    • https://uploads.strikinglycdn.com/files/3b50ce36-512c-4c64-8154-59a300512094/the_silence_of_the_lambs_book.pdf
    • https://uploads.strikinglycdn.com/files/716fe085-8897-492a-b575-6d6542c7acd3/55963978654.pdf
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_06923a63f22e44b9878787a5834ea7c9.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_off0000ec94.bin
05401c2f86b44c36c3479dafb598a4631b9e0f3dd6dca4d1d89f161833d43abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5976 bytes
font_01_sfnt_off000100d6.bin
4f698394d036c588807fef29a49a9f7480511102db3d6d95e4f64d2344fd5e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 10108 bytes

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