Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f9b6cfc9a33018…

MALICIOUS

PDF

96.4 KB Created: 2021-03-18 19:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 632d7c14ca18a0d7ad51ca3865a0aa10 SHA-1: c91ff76191eba85d8de443c0a6f329ed111c45a3 SHA-256: f1f9b6cfc9a330186541210d8444028dacb6844a24beee1688902d88c53dfe06
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://resalured.ru/123?utm_term=osteoporosis+tratamiento+farmacologico+pdf PDF link annotation
    • http://affilateapp.online/how_to_open_kenmore_70_series_dryern7q4o.pdfIn PDF document text
    • http://thepropheticapp.com/how_long_to_cook_a_turkey_in_a_hamilton_beach_roasterss114.pdfIn PDF document text
    • http://xaraxag.mypressonline.com/boxujavuzunesopo.pdfIn PDF document text
    • http://janexik.22web.org/triangle_classification_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425913/normal_5feb294acfbfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456663/normal_5ffb63407e1b5.pdfIn PDF document text
    • http://xasumemazekejo.scienceontheweb.net/america_is_not_the_greatest_country_in_the_world_anymore_reddit.pdfIn PDF document text
    • https://cdn.sqhk.co/kisudosus/XRMyrhg/44222153688.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/9mjjCNA/race_max_play_game_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_601bf9b6a4345.pdfIn PDF document text
    • http://koteyarn.moscow/ma_sociology_notes_in_marathi4m2yy.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/ghLd8WZ/character_generator_name.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/pediatric_advanced_life_support_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_603e7c0b12166.pdfIn PDF document text
    • http://easy-money-cash.space/stealth_cam_stc_gxvrw_gx_cellular_trail_camera_22_mp_verizonvc5rm.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/gfBhghi/55582663832.pdfIn PDF document text
    • http://bonifacy.site/sodapasixorebebijoxifetisa68kc.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
    • http://fuxitajudosev.rf.gd/zovufubatizire.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/bard_guide_4e.pdfIn PDF document text
    • http://pujusojup.epizy.com/27092503266.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/retewuzorekufat.pdfIn PDF document text
    • http://jimarol.myartsonline.com/character_analysis_of_macbeth.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/the_informant_tv_series_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/mibalatifopo.pdfIn PDF document text
    • http://fufibilola.epizy.com/89006494608.pdfIn PDF document text
    • http://vapufebifuv.epizy.com/bokirevu.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/pifej.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 5292 bytes
SHA-256: 1b8e13c7749457b3856d694df156db25da61302a676066354ec265640abfa0e4
font_01_sfnt_off00012954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 11692 bytes
SHA-256: 86e1193721cf138581e0904227978c101912d12db1c15bc6aa0520676b7ae9b6
font_02_sfnt_off00014fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE7 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off0001647f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e