Malicious PDF — malware analysis report

Static analysis result for SHA-256 376d2609cdb94b47…

MALICIOUS

PDF

80.5 KB Created: 2021-03-05 05:14:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ffc2054febb5b25e5f7ea20cdbb1566d SHA-1: 206cbed997b508815414756ae0e8673cbad3bf70 SHA-256: 376d2609cdb94b4775c22365fc31640a8c8484d5633bccb5771992a89b2d1669
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting strongly suggest the document's purpose is to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=tabla+de+equivalencias+de+unidades+de+medida+del+sistema+ingles PDF link annotation
    • http://normaa-id.com/surface_area_and_volume_of_pyramids_worksheet_answersqe1cx.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/fozujufurenes.pdfIn PDF document text
    • http://fortuneocredit.com/moradigonebobagefijonebn43j3.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/how_much_does_a_pound_bag_weighwioeq.pdfIn PDF document text
    • http://alsamcctv.com/42597433214pgzci.pdfIn PDF document text
    • http://clientbluebadge.com/dieta_pku_przepisynozon.pdfIn PDF document text
    • http://sobakin.space/english_reading_comprehension_grade_2qw8ll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_60346294ddde1.pdfIn PDF document text
    • http://luminar3-download.xyz/do_red_squirrels_eat_grey_squirrelsa3var.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366987/normal_5ff4026e69996.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/lujijuxeratewedasozi.pdfIn PDF document text
    • http://ibkreactiva2020.com/7460781820707714.pdfIn PDF document text
    • http://iqecoportal.ru/statistical_mechanics_pathria_solutions_manualtahgj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_60215d4a898fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_603fcd1f80f37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426971/normal_5ff05e14365f0.pdfIn PDF document text
    • https://pakipetunora.weebly.com/uploads/1/3/4/8/134881281/kaxeno_kopevisekita.pdfIn PDF document text
    • http://meetchat.space/why_is_my_uconnect_not_availablefyqla.pdfIn PDF document text
    • http://ewop.space/download_gta_vc_liteyk407.pdfIn PDF document text
    • http://abanca-electronica.com/rifakikoxiritukaz4prii.pdfIn PDF document text
    • http://chambrehub.xyz/tissot_t_touch_2_titanium_review6rr6h.pdfIn PDF document text
    • http://constructionhouse.info/why_is_waiting_for_godot_called_an_absurd_playq27i2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/que_es_un_proyecto_de_investigacion_cientifica_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/bojezoji.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/72044432434.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/jojubevavefowafasofalarun.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/pdf_booklet_maker_software.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 5212 bytes
SHA-256: 54d15985ce6ffe596c51abbf5614e2a3f1824e913bb2d627790466c80a77f6a5
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 12000 bytes
SHA-256: af8963211af8a2745c8afe7de7e6a7dce4d401dc659d900c660913bf1432dbcd
font_02_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71