Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac44c9f4898197a…

MALICIOUS

PDF

70.7 KB Created: 2021-03-19 09:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 483e704cfbc25b8e140834959d56866e SHA-1: db88feee4d0c46cad8ebe182444fda2025614c06 SHA-256: 0ac44c9f4898197a962d21f38a669fe1889b0075a8d95d32c43237fed04ba97c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards techniques used for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/strik?utm_term=new+testament+christian+church+hagerstown+indiana PDF link annotation
    • https://walugudosesex.weebly.com/uploads/1/3/4/6/134608180/sojixote.pdfIn PDF document text
    • http://ses-paypal.com/what_does_s.t.o.p._meanxhcqj.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/Bjcidie/best_daily_deals_sites.pdfIn PDF document text
    • https://ralifanexipoker.weebly.com/uploads/1/3/1/3/131380500/burofabilavived.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5fefed7398c77.pdfIn PDF document text
    • https://jivetekerujurar.weebly.com/uploads/1/3/2/6/132695216/6459789.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/ghiic5k/sad_ringtone_sound_mp3.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/gosetobusak.pdfIn PDF document text
    • http://13millions-warzone.store/nikewiruximulukov04t4.pdfIn PDF document text
    • http://okrasote.info/capacitacion_segun_autoreschi5g.pdfIn PDF document text
    • http://study-english-05.site/oxygen_tank_regulator_how_to_use7d2r7.pdfIn PDF document text
    • https://cdn.sqhk.co/mejiwimuza/jgIxhgc/ancient_roman_battle_tactics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_6029d202e5dfb.pdfIn PDF document text
    • https://bisebisa.weebly.com/uploads/1/3/1/4/131406118/tesetadorelipawute.pdfIn PDF document text
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/984625cd77.pdfIn PDF document text
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/6971948.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/bonafide_student_of_institution.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5fce585b0dbf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5ff63b0d7cc00.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/2QjaFwp/slingo_bingo_free_online_game.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/vewomo.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/6574031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligoroxenafof.atwebpages.com/judipesokivu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 5380 bytes
SHA-256: 9e41161c6fbac39246df2e4d0d886927b3887f0259d53e5ea8c9c2662350ce82
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 10876 bytes
SHA-256: cdd3b21b88874d1086110e448197f98ed15b29682f30bf9ba1d6e530865e02df