Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13ccf4aba3f9dab…

MALICIOUS

PDF

93.1 KB Created: 2021-03-12 08:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 44f117ceced1a8a25c76fc552a689620 SHA-1: ce1df48050433f8a856e264082d6ad35fcab439d SHA-256: f13ccf4aba3f9dabd9ded4c27bff6879d93aba6f4edf1e5948db48a8f921eb38
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to search results or awards, consistent with phishing tactics.

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://kuzutuzo.ru/award?keyword=carrabba+s+menu+prices+pdf PDF link annotation
    • http://raisinshub.club/kunevuwiropabamekajronu.pdfIn PDF document text
    • http://indohealth365.online/linkers_in_english_worksheetb7b9f.pdfIn PDF document text
    • http://zoom-omsk.ru/fisher_cr_9070u5lb1.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/tesurusixonadolitepesiti.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/sirujufejufi.pdfIn PDF document text
    • http://promoocaoameericanas.com/abecedario_chino_espaol4pruw.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/22792153759.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/f98lgi7/fifovazut.pdfIn PDF document text
    • http://numberoone.xyz/xbox_one_x_specs_fpsv5guz.pdfIn PDF document text
    • https://cdn.sqhk.co/xenetomapum/L8YibpL/4083211250.pdfIn PDF document text
    • http://stakingyfi.com/cds_ota_form_2020t21db.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/jokopi5b1eo.pdfIn PDF document text
    • http://letgtma.bid/buffalo_wild_wings_nutrition_informationu64mw.pdfIn PDF document text
    • http://sethel.xyz/23205503402mgdcv.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/gazitif/ug_admission_letter_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e6a080-7f4f-489e-ae6f-2d31adb21876/88403026400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df74b19-bdbe-44b5-85c0-60979e44fa15/convertir_120_ml_a_gramos.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/precalculus_graphing_polar_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/vosikikafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2eadd3-c8ed-4ff0-b5cb-0b68e5de2849/plc_programing_ladder_logic.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 5316 bytes
SHA-256: 07ef8cb820abba9d725d294e287152107aa86e24fb5e578f0eef649572d830d0
font_01_sfnt_off00013912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 14532 bytes
SHA-256: ad2a50764783cb59eaf74360767afccffbaf32a82be27139bbb70e42ca22fe6c

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