Malicious PDF — malware analysis report

Static analysis result for SHA-256 5646c16504e4eb8a…

MALICIOUS

PDF

84.4 KB Created: 2021-02-18 11:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f9dbfda419fb2f92567a32552f01bddd SHA-1: 314918081008314ecd1c8c179697396a57c776a0 SHA-256: 5646c16504e4eb8a3da8d130e78313764cd0f1db197ff16573022270b4b43138
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. The presence of a 'download' button lure reinforces the malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=super+mario+64+hd+apk+sin+emulador PDF link annotation
    • https://cdn.sqhk.co/tinawegu/Ehfiang/airfighters_combat_flight_sim.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/lgczSjf/25764717186.pdfIn PDF document text
    • https://jekodijup.weebly.com/uploads/1/3/4/4/134490718/mitozasanerevixelis.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/ifWxie6/nostalgia_definition_oxford_english_dictionary.pdfIn PDF document text
    • http://zalixunepujo.22web.org/austin_mahone_songs.pdfIn PDF document text
    • http://hq-cleartv.info/267615059193pqsw.pdfIn PDF document text
    • http://drnextact.xyz/millionaire_trading_mom_1k_club_reviewsrukkw.pdfIn PDF document text
    • http://kinokaiff.space/xekavebemomamokumiputiq47dx.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/hDKOehh/callaloo_box_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/gDMchgi/69080036946.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/jhib9jd/pomajifak.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/ehgjhjh/my_talking_ginger_game_online.pdfIn PDF document text
    • http://ruseseru.iblogger.org/puwafojivaganogurazoripeb.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/womovemojefav.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/iidDTjg/90798308394.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/4V7old7/52731125632.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zunufofidufup.rf.gd/48867996760.pdfIn PDF document text
    • http://junixaz.epizy.com/attendance_management_system_website_templates_free.pdfIn PDF document text
    • http://dipulitexaxuz.epizy.com/academic_performance_of_filipino_students_in_mathematics.pdfIn PDF document text
    • http://finuximiwogum.rf.gd/60923059192.pdfIn PDF document text
    • http://wisexek.epizy.com/fokudumilezu.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 6384 bytes
SHA-256: acedc839b4d9e0716bdd525cb02e6b9c5dd6d9e8c8e580849d6460eb072ede0d
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 5608 bytes
SHA-256: 4f2660d8e8d772d49f742edc13b107b1e45505680a83688a63787e85777b8c68
font_02_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 1592 bytes
SHA-256: 03ca5f0e90e93833b7e5384fb6a60dd707475b667dcf61a13adfa5b714d0825b
font_03_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 10252 bytes
SHA-256: 2808e4dd3d3396ff13d4125e3f06ed4cadb9f261298bd90aa049d28500ae4367
font_04_sfnt_off00012e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 16096 bytes
SHA-256: 43254c6337662e76ed67025008a42d76121bee43b935a85a5f582473253d5118

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