Malicious PDF — malware analysis report

Static analysis result for SHA-256 f043992869723901…

MALICIOUS

PDF

97.4 KB Created: 2021-03-21 21:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cbb6d2c3ae51252944f3d1148a67ad67 SHA-1: 7c58d0149fd0e1931a2ceb7681bc1e982335a747 SHA-256: f0439928697239015eb9781fca369bfe197244bf91e1a0662be156373b786a7f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The PDF structure and embedded URLs point towards a spearphishing attachment delivery method. No scripts were extracted, but the overall pattern suggests the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=music+notes+drawings+step+by+step PDF link annotation
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/9723067.pdfIn PDF document text
    • https://sibemawiwojaro.weebly.com/uploads/1/3/4/8/134887292/6250624.pdfIn PDF document text
    • http://pavezala.iblogger.org/kiera_cass_the_heir_read_online.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/hp_officejet_7510_remove_printhead.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/lelujuxijamu.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/ponniyin_selvan_2005_tamil_movie_online.pdfIn PDF document text
    • http://pubgmobiie.com/teranuvimexesawumifumu43xvo.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/99879766810.pdfIn PDF document text
    • http://ketotreno.buzz/simpo_merge_split_free7ldl2.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/32161417478.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/jajotorig.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/present_and_future_value_tables.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/31076324724.pdfIn PDF document text
    • http://itabody.space/branko_copicim2pg.pdfIn PDF document text
    • http://kusufuxufatup.getenjoyment.net/79553922520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31468d54-b501-4111-897f-045ab682845e/2014_ford_mustang_gt_premium_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256a9313-0631-48cd-9213-51f1c90100f4/sistema_endocrino_hormonas_y_funciones.pdfIn PDF document text
    • http://bufizufidubak.rf.gd/betelutufino.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/lemolutitodafudakirak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b512287f-bf27-43ea-aa21-2a175472d6b6/what_is_the_average_price_for_a_water_softener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fbbbe8a-90e7-4e59-9043-173672576ee9/73311841225.pdfIn PDF document text
    • http://banugigo.epizy.com/credit_agricole_egypt_annual_report.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_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 5548 bytes
SHA-256: fced6f37fbcef855b6d77dd81e5b861e24917fd158475d36201ae14dd7552468
font_01_sfnt_off0001378b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378B 12032 bytes
SHA-256: 0bd48cf087365f84f4cacd521a88546914bbd23dbc12a3075c46400dcb6f2746
font_02_sfnt_off000160c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C5 16200 bytes
SHA-256: 9527d77a8ddbff7143f4b9d9ffa6a9c0a17c14fbd864be9d9139927b2451880e