Malicious PDF — malware analysis report

Static analysis result for SHA-256 31eb3bb87996d056…

MALICIOUS

PDF

84.2 KB Created: 2021-03-11 10:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 0f8795478fa202af5e87d87a8883991e SHA-1: 5c806b556c5a73410e98ebb974f4f722d20b7061 SHA-256: 31eb3bb87996d056116c3895d78634d6df4882f566a91fcfdbaf7e1cb6617116
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=words+of+praises+to+god PDF link annotation
    • https://cdn.sqhk.co/wajerewuwer/QiKhcGw/mascot_dunks_game.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/vusodakufeziveke.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/what_happens_when_garmin_vivofit_jr_battery_dies.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/mossberg_930_hunting_all_purpose_field_review.pdfIn PDF document text
    • https://cdn.sqhk.co/baxewoxevum/nxG3xjf/claw_machine_arcade_singapore.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/what_is_development_biology_embryo.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/iijhfqn/epic_games_can_t_enable_2fa.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/paraben_in_cosmetics.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/vutinanumeworibonakud.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/jJvLghx/nemegeloxerekafipujuju.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/ia5aFAE/34246945053.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/50389215294.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/HXdBidp/tier_list_maker_download.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://s3.amazonaws.com/xunilukegez/kia_sportage_2017_review_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c86350d-2f04-447b-875b-81076740d3c8/what_are_the_7_deadly_sins_in_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a60b01-60ed-4d7e-aaf4-a2d811acc248/what_age_is_matilda_suitable_for.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/54367978527.pdfIn PDF document text
    • http://vekejuf.atwebpages.com/lavazza_espresso_point_matinee_beverage_system_coffee_machine_m11121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfd8232-13c9-46a0-bf3c-7542a4114fdb/romeo_and_juliet_leonardo_dicaprio_where_to_watch.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 4872 bytes
SHA-256: c653a706ba3ab4742721772455096b4c9cfe3607fdd1c39aad04e2967c7f442c
font_01_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 10116 bytes
SHA-256: 9a1f660f14b7be6ebb21f3aef803a0f59df2333c04030a359a042c40b6625927
font_02_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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