Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f24500791425d0…

MALICIOUS

PDF

81.5 KB Created: 2021-03-18 23:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4a345f63ceeeeb00204aa415c8842aa8 SHA-1: edddb2e288b9b8bf09baed3b09cd32f091067dad SHA-256: d9f24500791425d059b7a8487c19b7e70b503567712580c3eddb00588f375491
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/wix?keyword=eastern+woodlands+shelter+information PDF link annotation
    • http://sulelufisumi.iblogger.org/pupepojared.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/84789627953.pdfIn PDF document text
    • http://martakkord.ru/509793964as2a2.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/57225853457.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/casio_xj_a142.pdfIn PDF document text
    • http://sewukagazub.mypressonline.com/bowobaxowejubo.pdfIn PDF document text
    • http://dilurijarejo.22web.org/2._5_inch_binder_spine_template.pdfIn PDF document text
    • http://pokypka.xyz/47769482212016sa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5ff5a34ce06d7.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/eyelash_extension_aftercare_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_6036d10fe39b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448550/normal_5ff9ea3149ec3.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/69570148610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411483/normal_5ffe92eec60ef.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/maus_art_spiegelman.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_603e2b27edabe.pdfIn PDF document text
    • http://nerazegizetikam.getenjoyment.net/surface_area_rectangular_prism_worksheet_answer_key.pdfIn PDF document text
    • http://dofegogojewipo.iblogger.org/73618096574.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/9749456480538kg0.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://uploads.strikinglycdn.com/files/b2b73205-c9f1-4d3c-9074-427989797b40/48010245940.pdfIn PDF document text
    • http://wokidomogu.onlinewebshop.net/achtung_panzer_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab337f0-7852-4c15-9245-3355be3ab5c2/can_i_use_my_xbox_turtle_beach_headset_on_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db205c9-3095-49fb-934d-30f4a916bd96/roland_spd-30_octapad_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290186c5-6eb4-42ec-8da9-21587330c5c2/hp_laserjet_m1212nf_mfp_scanner_driver_mac.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/sierra_load_data_350_legend.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_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 4984 bytes
SHA-256: a34001d5fa1215f1d3a394310f0337bfac63d6f9a844950687fefff20d9d1c7b
font_01_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 10376 bytes
SHA-256: 1a8bf7350c519d73132d953922d590be15870a2ef5698ba916bccc8553466a3d
font_02_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f