Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a32090fc90261a…

MALICIOUS

PDF

68.8 KB Created: 2021-04-02 12:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8acbff48fb1738064668fc81ce6b3819 SHA-1: 10cf96d5c157276886ff116bb15af884d64f6a99 SHA-256: 84a32090fc90261ac939800339480d28389b524436fe96321031168eb95c5111
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and appear to be part of an SEO link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous external links suggests an attempt to direct users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=kenneth+e+hagin+healing+belongs+to+us+pdf PDF link annotation
    • http://rostov-mobile-doctor.ru/marathi_calligraphy_fonts_free_for_picsart0z9md.pdfIn PDF document text
    • http://seplafond.xyz/trumpet_tune_sheet_musicri09u.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/dakizolusapusadep.pdfIn PDF document text
    • https://nasamokazefo.weebly.com/uploads/1/3/6/0/136049887/fuguwalakadap_webozitewekeki_rizedurepure_fefanip.pdfIn PDF document text
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/kopulex-nudulupusig-gapenufipudid.pdfIn PDF document text
    • https://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/bcb5f.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/dr_seuss_books_learn_to_read.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_df604d9c21414cd3974ef70fe3806e3a.pdf?index=trueIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_0716ad6fa8184866813da01c23312d45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/62458743262.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/6713300676.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/wolf_reference_sheet_base.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_624966594d7a4e15a85ee6364fccb21c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11878850-21f9-4320-91ca-5afbc07b8433/hamilton_beach_coffee_maker_k_cup_compatible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d0b942-8619-4aef-ba2b-92b95d514ea9/jazasujimewodaxuzibet.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/sogifam.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/wimenifonidufixovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/405559d4-7048-48b3-b433-fba107310407/6594144527.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/81001087909.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/78723228527.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/bitter_melon_nutrition_information.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_8a03c53bfc2d41d19a9fa8e3491a7fe7.pdf?index=trueIn 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_off0000cf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 5316 bytes
SHA-256: 88fa8c78c9679749efe18f0c3d40af93c094234cb4c09879b9372dece4053d78
font_01_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 10116 bytes
SHA-256: d14dce4876829478ab53b927de69b6d15d50323af8e8eb15c29d41dc32dd1725