Malicious PDF — malware analysis report

Static analysis result for SHA-256 3304bd52249db99e…

MALICIOUS

PDF

83.9 KB Created: 2021-04-03 22:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 057796d6cf8c4e5fbd292bf36d7a54a1 SHA-1: f2534ebbfdff761910f6565bc52df911c5321950 SHA-256: 3304bd52249db99e0eeb73cf3f89ba7f40a78a55955720520758fee16a00cc61
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with the primary suspicious URL being https://ponafet.ru/award?keyword=solving+equations+involving+fractions+worksheet+pdf, which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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://ponafet.ru/award?keyword=solving+equations+involving+fractions+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/zurefaxenov/pjbmBhe/hydro_dipping_patterns_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/W6Ex4Px/shadow_knight_era_of_legends_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/djfhj0E/cash_app_wallet_refund_number.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/wosapexesewalal.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/war_of_the_worlds_2019_tripod_sound.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/that_will_be_fine_faulkner.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/jgzhg21/british_indoor_rowing_championships_2019_results.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/crossfit_training_program_download.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/g2IOjia/como_ganar_diamantes_gratis_en_free_fire_ios.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/taurus_pt111_millennium_g2_9mm_pistol_review.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
    • https://uploads.strikinglycdn.com/files/26f6f2b4-2db3-47b5-994f-ac21dead531e/xojasiwovelot.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/85748806871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4724d84e-65c7-4e7a-a5af-87628433d00b/zezozipesupipop.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/ramokaseboxuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30638c9-ba98-4bfc-80d9-c99beff46860/masterbuilt_oil_free_turkey_fryer_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8dd3ad6-4723-4c5f-968a-4761a9ec6ab7/42678007389.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/varicela_en_adultos_tratamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/31170828392.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/taluluzadusoj.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/sewumavekarefak.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/jedigumuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/faxujasurelad.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/53236786688.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://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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 5744 bytes
SHA-256: 7b024a9f98e236b62097abe52e9a0044fab794b8dbe6e4f599ac368ad1b7dc85
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 10576 bytes
SHA-256: 7fe2aeb03a7179c87ee9a00560005d4e47c57b1cb76f367bc5d2b2f7024eb3cf
font_02_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357
font_03_sfnt_off0001331d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71