Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d56a52cefcc9bae…

MALICIOUS

PDF

97.8 KB Created: 2021-03-20 15:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2ac58f0a484717cc3864c573eb16c5a2 SHA-1: 650e58b3da0d5dae0ff0129f10f6a4153e5ca807 SHA-256: 3d56a52cefcc9bae8a34869b2ec503b399a8f4cbacc1893b72a298c18861817b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/award?keyword=asmaul+husna+dan+artinya+lengkap+99+pdf+download PDF link annotation
    • https://cdn.sqhk.co/litopozuf/Uihjbjc/jack_adventure_2_platform_jump_run_fighter.pdfIn PDF document text
    • https://zanazajerepa.weebly.com/uploads/1/3/4/0/134012527/6522997.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/bugow.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/cdTnie8/luminocity_festival_2020_new_york.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/giiFjgK/chemistry_books_free_for_iit_jee.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/bgjzgcA/arcade_fighting_games_play_online.pdfIn PDF document text
    • https://barosowuni.weebly.com/uploads/1/3/1/3/131398377/riputazipesukogugof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ebc380-431a-46ac-9a8d-d008c96f8a65/bayliner_service_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0691c3-c14f-4ab3-8101-88799c1374d1/balid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ed5f34-4230-4633-96b7-81fad66614a6/kenmore_accela_wash_clean_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a517307-9b2c-48d7-b697-fa84fb47e315/27679831577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7de3d64-e0b1-4c4a-971d-d6f2f10e1904/left_behind_series_book_3.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/62598555562.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/79153087178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28591ab-4fe4-4953-99c5-8289d8550430/how_do_i_reset_my_moen_garbage_disposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0531685-a968-479f-801a-bbd1df24ade9/tatizivajeliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5de8ef5-c86a-4ff1-8b75-f8ec2ed3a35b/hayward_sp3400vsp_ecostar_vs_variable-speed_pool_pump_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57fed938-cbec-4150-9971-9a6f3052942c/principal_data_scientist_salary_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9146e04c-6bde-48d8-85b7-26f700dd97f4/27313319104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038ce252-c56c-4543-be64-95a613c7176f/factory_reset_dlink_dir-890l.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/luther_season_6_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/11529897670.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/scoreboard_template_css.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001456c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1456C 29232 bytes
SHA-256: 9c9c2cf84e9afc02843ed306498213c5a12cb3875fdef53d68be3efd86ad391f
font_00_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 5860 bytes
SHA-256: d3d214fe60eac9263681b203c064acfb21f5dcea71c520773636c959c0d9e6f3
font_01_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 10816 bytes
SHA-256: 50ea9ac42258a5e000ba40b3ae14b3e67ff6c0dd7ccf0ab7ff77c948e9c58fa2