Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa7a8775323fb43…

MALICIOUS

PDF

74.0 KB Created: 2021-04-08 03:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: df9f1eae22ec4e7e11d514269c6d95b3 SHA-1: 527e03dd081afd4b1632d0661f9d419adee1b6d8 SHA-256: 4fa7a8775323fb433cc5e78e73e9c26a9386406554ce68d871d423b426b4b5e2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://degifutuv.scienceontheweb.net/be_at_one_menu.pdf In PDF document text
    • http://jewlgems.com/2019_mahjong_card_errormh2ib.pdfIn PDF document text
    • http://www19216801.site/what_does_public_mean_in_public_relationskyab6.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/blood_and_guts_a_short_history_of_medicine.pdfIn PDF document text
    • http://salonvarna.com/chandramukhi_tamil_full_movie_videoh9r2b.pdfIn PDF document text
    • http://passive-income.ru/134783838811l904.pdfIn PDF document text
    • http://xolimaked.iblogger.org/5017418526.pdfIn PDF document text
    • http://clubstore.info/aiag_spc_manual_2nd_editionoyjac.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/dibujando_con_el_lado_derecho_del_ceh50y9.pdfIn PDF document text
    • http://bezprovodov.guru/pabazovazejeleg87bsi.pdfIn PDF document text
    • http://prizinsta365.online/sefurari5bmbr.pdfIn PDF document text
    • http://nemagufi.mywebcommunity.org/59517646430.pdfIn PDF document text
    • http://3-bureaureport.info/zotifiroraxuwaxixodojon4cuqa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=how%20to%20make%20candy%20cane%20lollipops%20decorationsPDF link annotation
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_828305a86a254dcdad354a95b0e875d6.pdf?index=trueIn PDF document text
    • http://wudazebej.atwebpages.com/how_to_increase_pressure_on_breville_espresso.pdfIn PDF document text
    • http://pimogajen.epizy.com/l_alimentation_quilibre.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/air_force_1_white_womens_8.5.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_68c0c5bed83243fba5133a046c7cb06e.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 5436 bytes
SHA-256: 03364ac5bcc68990b483f719f9dddcbb4dee2f133fdb5a97d9232e2acfe15235
font_01_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 11176 bytes
SHA-256: 2874397301ebd68bc258d032d1888ea6a1640a56982ca0968d86503877d94c79

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