Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd557a1550bb2d1…

MALICIOUS

PDF

80.2 KB Created: 2021-02-27 05:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 053f21a6047f1cdecc06fcae46fe8233 SHA-1: b2326ca426651bd65a4855f5b863ecb0b119ec5a SHA-256: ddd557a1550bb2d1cfb6d388e7e37442da8c84e4fabf9776870b37ef665b8c6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of external URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=fender+mustang+4+v2+review PDF link annotation
    • http://copyrighytsupport.com/handbook_of_clinical_anesthesia_freef1mu2.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadumiza/R2S6OSd/24003453292.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/52750a43.pdfIn PDF document text
    • http://sollabs.xyz/pabitalazukezuminazemavur1oyv.pdfIn PDF document text
    • http://afracheat1.xyz/dasopowizarosr4i.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/iadjfDE/wodopu.pdfIn PDF document text
    • http://rusherx.studio/93885485231rtt7l.pdfIn PDF document text
    • http://golden-charm.ru/35128249225kp6z1.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/can_i_substitute_vinegar_for_keurig_descaling_solution.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/1ibgiia/red_boy_pizza_larkspur_coupon.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/saranidonagox_xesabo_tunako_gokafidugibo.pdfIn PDF document text
    • http://inmyshtangen.xyz/tujidiwugoxavuwagbiyg8.pdfIn PDF document text
    • https://wigojakumadofef.weebly.com/uploads/1/3/1/6/131606024/65917.pdfIn PDF document text
    • http://itfamily.info/latex_beamer_madrid_templatej1hcq.pdfIn PDF document text
    • http://nuveclovet.xyz/direct_and_indirect_calorimetry1opuh.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/gamul-dugidok-vurapav.pdfIn PDF document text
    • http://kapusta.pro/99588068609tc60m.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/didowugorokirug/javafx_scene_builder_templates.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/how_to_invest_in_stocks_exchange.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/14477088741.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/big_blue_bus_8.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/42373390275.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/toner_para_impresora_brother_mfc-8480dn.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/syntax_tree_diagram_exercises.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_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 5440 bytes
SHA-256: a2dc4cdb8164633e2a9583bb876ad283db3430f694eb586abbd469ed12bc4110
font_01_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 11736 bytes
SHA-256: 1ab22f90cea073a38ec7e1c8de1c230bebf9f1a98f67eb5615d904849e6f3632

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