Malicious PDF — malware analysis report

Static analysis result for SHA-256 077626bc7cf4274d…

MALICIOUS

PDF

84.6 KB Created: 2021-04-25 18:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3475677ea02701d46fb3d195c53050fe SHA-1: 4b0a0ddddb1caf149d93af051aabd034174a9dea SHA-256: 077626bc7cf4274d754a9f16b9c4bf2709f3aa8555c0d9851ea74061781d7643
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=how+much+does+it+cost+to+service+a+sewing+machine PDF link annotation
    • http://bioforcecolumbia.site/canadian_citizenship_certificate_instruction_guide535tb.pdfIn PDF document text
    • http://sadovik.me/97888722140ep0e7.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/what_is_grant_of_letters_of_administration.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/81030028106.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://sandiego-podcasts.com/the_pilgrims_progress_movie_reviewv3899.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/28640535117.pdfIn PDF document text
    • http://eurozone.pro/twilight_eclipse_movie_download_in_hindi_480p8zcgh.pdfIn PDF document text
    • http://pokuwasu.iblogger.org/relative_clauses_with_prepositions_exercises_with_answers.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/75583367072.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/xoxaraxifififipuxok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobobowu/dukebibojiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf8ef5d-9669-45bd-b9bf-dd4a36eb97f1/17688381288.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/super_walmart_near_me_pharmacies.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/picsart_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732804a6-758d-47b3-8def-64fe6df741ea/vapufora.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdfIn PDF document text
    • http://namezenidel.onlinewebshop.net/nalorefazipopigowol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed7cf5d-08d2-4991-a6a5-2be450a8bbb1/kozadenakarodosel.pdfIn PDF document text
    • http://zujifonep.epizy.com/centella_asiatica_acne.pdfIn PDF document text
    • http://talizojewebovob.rf.gd/biravowajewuxoduvuse.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/guidelines_for_blood_pressure_diagnosis.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/luponokasado.pdfIn PDF document text
    • http://rolewafofe.epizy.com/barbie_girl_movie_in_tamil.pdfIn PDF document text
    • http://runijagaf.rf.gd/46416123480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581498ae-319b-4bae-b18d-5931e5a595ca/do_books_have_an_age_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cab7d67-4853-4d5f-a3ce-85f2531c95e0/losedubolosovurawuremuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 5436 bytes
SHA-256: 53881281c308513c4505cd88653694ae184fd79b0229c48f87cb3dd093ed91b1
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 10284 bytes
SHA-256: 9b34e624498ff83a58f458f894fa92ccc26af787739175f91c27334b9d5dffd6
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 16680 bytes
SHA-256: d2aeddaa4d0fb7f933d41cb389a98ee2e0c772468f4e917aaccd806ec494d3d7