Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89e7943f0098a59…

MALICIOUS

PDF

85.5 KB Created: 2021-05-16 05:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8d8f0952fa83473c2bdf51249f9965a7 SHA-1: 5a7c5702cd609483ebc9492ba5330b0c3d9f99fe SHA-256: b89e7943f0098a59885434faca852475a4538ff3ac049c4fab52ff3562b4d838
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as Pdf.Phishing.Trojan. The presence of numerous external links, many pointing to unknown or potentially malicious domains, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://mezovuduw.ru/strik?utm_term=munchkin+dungeon+rules PDF link annotation
    • http://wuwadipuzemorib.22web.org/what_is_3_characters_long.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/majubifabe.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/chainsaw_carving_patterns.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/33160036518.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/83432910424.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://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_4f4749ca531c4950aed3cf0d3df77cd5.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_f06edb1a512e432fb3de35f29e8e00e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/draconian_ritual_book_asenath_mason.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/samsung_android_phones_best_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1281319c-5de4-4151-af44-03e685df0608/vilizonori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592d2fcd-8a1b-4154-b93c-39520cac6d81/potaba.pdfIn PDF document text
    • http://tididesonorevo.rf.gd/budget_2019_malaysia_bahasa_melayu.pdfIn PDF document text
    • http://badiwiv.epizy.com/repimej.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/faxitujifowikawe.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/camo_camo_radio_on_ringtone.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_da58dd0193e245f69d634d6b676acc62.pdf?index=trueIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_9d3b3fd08f4f4f47806959f662e67e89.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_70576aeafce442e18c24429f2d3b2f33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39bc9c56-6642-4a16-84fa-335dc632d592/how_many_stock_in_bse.pdfIn PDF document text
    • http://duvovopuma.epizy.com/nobasixoloderizowesel.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/bemos.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/vavogesasazufokutarutu.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/designated_survivor_season_1_episode_10.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/what_am_i_riddle_answers_46.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_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 4864 bytes
SHA-256: 7401ec5c5080e17ccf366e852fe710177d8f58fdb77f447fd6dbb1b1c1191f84
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 11320 bytes
SHA-256: f9ac6b91ed4e92546de8b8d18b9d121c1cfda363e2dc7cc4d8b341fac6713455
font_02_sfnt_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 16376 bytes
SHA-256: 069f5cdcb972b33999f3dc18a3e5b847fc2aa024b7c5b45b4734cedf253a8e5c
font_03_sfnt_off000139d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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