Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4a2d23bfbc21f0…

MALICIOUS

PDF

103.7 KB Created: 2021-04-08 15:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 78fcd901b8f4771651ad3f39dd718bc0 SHA-1: 4ce04594cff8595ddc01df060eebe0b6a85697f9 SHA-256: bb4a2d23bfbc21f062c7252bfe824adfa3f3e5e948032f50a5f5788ca5c33477
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are disguised as download links for media files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9810

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=heart+touching+painful+sad+love+story+mp3+song+download PDF link annotation
    • http://wurigebabisu.iblogger.org/45994970755.pdfIn PDF document text
    • http://gufutaca6.xyz/tropico_mofongo_menux7v5c.pdfIn PDF document text
    • http://blockhcain.host/924681886716pawt.pdfIn PDF document text
    • https://cdn.sqhk.co/bemapebe/gjlgfh5/basketball_world_cup_2019_live_stream.pdfIn PDF document text
    • http://fenellalucynelle.info/29636165595sfpcn.pdfIn PDF document text
    • http://fastcreditreport.info/pfaff_varimatic_6085_manual_free82e43.pdfIn PDF document text
    • http://adv-workshop.site/hide_photo_video_app_apkaukpx.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/fjg3Xhc/61084622887.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/dhijeOf/tesepirewe.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/g3hhhgI/19455426669.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/Vghggrk/sizigu.pdfIn PDF document text
    • http://item-mask.top/xobogenaxitupitimudemofhlktv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b910dc-f3cf-4a59-86e6-f2c7dc82fe45/90040274340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f7847d-8809-4f33-bf47-9adc403874f6/what_are_good_networking_questions.pdfIn PDF document text
    • http://numololutevib.epizy.com/razoval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c321c16-1c33-4d13-b9bf-8031d4598018/equation_of_a_circle_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97cfe111-5eba-4cca-a973-925ab254edab/ribigeg.pdfIn PDF document text
    • http://zudozam.epizy.com/pdf_acrobat_pro_download_free.pdfIn PDF document text
    • http://loxototo.epizy.com/how_to_replace_a_battery_in_a_nuvision_tablet.pdfIn PDF document text
    • http://danuxobuzo.rf.gd/understanding_and_using_english_grammar_3th_edition_download.pdfIn PDF document text
    • http://rogokumopukizu.epizy.com/86991963068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f011d24f-42cc-4055-9f41-c1b78f10004e/sportline_electronic_pedometer_350_manual.pdfIn PDF document text
    • http://labukifured.epizy.com/74687073932.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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 3840 bytes
SHA-256: 34c3c5a213cad3d6fa62d10fc53ce6dc1cbd684be03165a24577d9eb3117d56c
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 5832 bytes
SHA-256: bd5d708b3611b9686b7070fb085e652e80e35e38078808df7d233534c9367f3a
font_02_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 5152 bytes
SHA-256: bd2a38ab367ee47333c13dca2b292170f4d49e3ec0a92689c878def19ddf2ebd
font_03_sfnt_off00012750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12750 4308 bytes
SHA-256: 6a81941388c2b4a0602e48f5718cd525a2ebd2706246738c00a5bd40c29d61cc
font_04_sfnt_off000137c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C2 11176 bytes
SHA-256: a7d6d458e1733f682010cebf6542413f3296a0a6cc2a1ecf0ffb8c5e912716c4
font_05_sfnt_off00015e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E47 16280 bytes
SHA-256: 310f476d76fac0d775ec9c99fb42595021c2181624a7b762170f1749e551d171
font_06_sfnt_off000173fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173FE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_07_sfnt_off000181fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181FE 3080 bytes
SHA-256: f6ca7056f2c11f65946096eb7ef457c8c2b54407860db646505d06581dda7b31

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