Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13fbe5bb1dfba3c…

MALICIOUS

PDF

78.1 KB Created: 2021-03-08 08:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf243456fa57a0e2eab55dd6d3a28540 SHA-1: 3e66a70e21d1cb7f30d8c4224f733aaf0a76b5a7 SHA-256: f13fbe5bb1dfba3caf3d738b3703f620c600e6524308d93c1d7abd8b30a7a706
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The document contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of 'curl.pdf' in the document text hints at the potential execution of commands, possibly to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xezojetit.ru/strik?utm_term=dunkin+donuts+hazelnut+iced+coffee+recipe PDF link annotation
    • http://lebedugipul.mywebcommunity.org/56229743899.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/7604519322.pdfIn PDF document text
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/15b1d5.pdfIn PDF document text
    • http://starkrobotics.org/daravomufesadiloxevazojek7aimv.pdfIn PDF document text
    • https://jivudajen.weebly.com/uploads/1/3/4/4/134470456/pegarafederuxo-derogab-gijupiva.pdfIn macro / runtime command snippet
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/xuxipetopej.pdfIn PDF document text
    • http://rakuxijewimafud.22web.org/baby_hospital_checklist.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/is_focusrite_scarlett_solo_good.pdfIn PDF document text
    • http://naturmilans.fun/jiguwuxejatp7r3k.pdfIn PDF document text
    • https://fugurisugo.weebly.com/uploads/1/3/6/0/136086283/859c3426b480f.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/82177168489.pdfIn PDF document text
    • http://getsol.xyz/julius_caesar_play_cast_listq2a6d.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/metodologia_de_la_investigacion_cientifica_sampieri_ultima_edicion.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/d8437be7-5a8e-4fb9-9d48-3a3ed4a349ed/how_to_work_out_the_estimated_mean_from_a_frequency_table.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/resistance_band_seated_bicep_curl.pdfIn PDF document text
    • http://gebogozomusedom.rf.gd/judas_maccabaeus_sheet_music.pdfIn PDF document text
    • http://dufapojemuju.epizy.com/how_to_charge_s107_helicopter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91d1e9a-95d1-4921-ab97-1a70d0a7d46c/how_does_a_roosa_master_pump_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25569f6-360b-44a5-9229-6292a03300b8/zixazatajedikuwezu.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/zaguwutalonagewudug.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://gebogozomusedom.rf.gd/judas_maccabaeus_sheetIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 5356 bytes
SHA-256: 0697b063264d637051da3c20c1f57160cbde1c441f1fb177663970028e080a26
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 11504 bytes
SHA-256: db1368ca2f710009dc2a88fe6f7fd51212713264322903c6ea5349f439c1ac9f