Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdba7b2f278cba3…

MALICIOUS

PDF

99.9 KB Created: 2021-02-28 10:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7496845d153b340eebf92626e854a4b7 SHA-1: d48fc32084e185ba863ae0d617875e48c0104698 SHA-256: 2bdba7b2f278cba30a39e104dbeef5a6e70a81a936f991c9fa45dadeb28cbc70
204 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PRC/3D content and numerous links on disposable hosting further supports a malicious campaign aimed at redirecting users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=attack+on+titan+wiki+134 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5fe8d999427a2.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/duWQQig/36424943882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420586/normal_5ffcaacf64a7f.pdfIn PDF document text
    • http://enots.space/retikokokifoxifopozok7gelh.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/Hgi3NEP/sofezefesanesomovaveti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5fff457eeb02f.pdfIn PDF document text
    • http://trenketo.buzz/73410047244512gr.pdfIn PDF document text
    • https://cdn.sqhk.co/mesodimeduje/yiibhiJ/nadoxemazetagofomevinodab.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/egh5akH/baby_azaria_chamberlain_clothes.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/bANkEJY/skip_bo_cards_near_me.pdfIn PDF document text
    • http://unityfree.xyz/61576501417l7v7x.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/6ziguw0/vofodom.pdfIn PDF document text
    • http://usacreditscore.info/posunisekew40h89.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/dBjiii2/pokemon_go_arlo_counters_march_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_6001471e8bbcf.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/jUA4Mjb/29674547069.pdfIn PDF document text
    • http://fruitnaturs.space/570955378142uszd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5feb4e39bf11b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/discount_formal_dress_stores.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/11568974921.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/anexo_iv_simples_nacional_2019.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_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 13356 bytes
SHA-256: 82b11b309256635d639c31c4b36ac1550565ff1be9950c1707c54bd74c73e72b
font_02_sfnt_off000134ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BA 4936 bytes
SHA-256: c5e55a9b3f51e33ad3c866379915a9a7e44d1c1cb2e21409a466fb5d43448220
font_03_sfnt_off000145c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C0 10576 bytes
SHA-256: 34a8a22e6c8d55912cdc33b60e887bcc9f574f06751ad332e5ef42a9006bffef
font_04_sfnt_off00016a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A15 16224 bytes
SHA-256: 2dba4c156020a37def27a3588e87d5d7a9273750228fc737d8c6e2dd4161031c

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