Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e35aecf2e7f031…

MALICIOUS

PDF

80.8 KB Created: 2021-03-26 06:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: baff123681fd5fa3e7c8ae5685093c94 SHA-1: 26e90f1f434161b8f54fd793453c368f22a1d7fc SHA-256: 71e35aecf2e7f0315727ce7c4fd202d35a91622c1992cf80864f27dfbf5f71d8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, contains text related to 'Vanity fair outlet stores in reading pa', suggesting a lure. The presence of numerous external URLs, including one pointing to 'zajinet.ru', indicates potential redirection to malicious sites or phishing pages.

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://zajinet.ru/strik?utm_term=vanity+fair+outlet+stores+in+reading+pa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5ff905b292f6a.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/hcovVy8/verasijopixuwasofufef.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/BrBwbhf/89812913773.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/Qgc7d5s/free_read_along_books_for_first_graders.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_6051b28d0a9c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6050c978c7172.pdfIn PDF document text
    • http://smm-target.ru/76382188634esksi.pdfIn PDF document text
    • http://megalit-korolev.ru/483451664454qktv.pdfIn PDF document text
    • http://alexandreablog.com/tojezom2a1z2.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/nufuja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412170/normal_60032079aa998.pdfIn PDF document text
    • http://zapitexidij.mypressonline.com/tukadixina.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/4ihMOxk/57432592227.pdfIn PDF document text
    • http://catsism.com/18289532774q80tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_60354d78f2ad5.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://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_14e4463891dd44caa85c885cc23aa086.pdf?index=trueIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_a35cf1c93ccb40fd8240506c2297e294.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0b0b70-f985-4b30-8fe3-ee4d3196fcd4/99645584296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f01028-cfb1-44d2-ab69-de5c696b718e/how_do_you_start_a_masterbuilt_electric_smoker.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_04535f3c4c414acfa2e08b1b456755a5.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_524593fe45424e8b94b33c3c3512af2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a36299-a7a4-48ac-ae10-af0b49812b04/soleroboni.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/verbos_irregulares_en_ingles_y_traducidos_al_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17547be9-76de-4ee7-b275-ffa73aedb694/debenufawu.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_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 5160 bytes
SHA-256: c6149493b42a211f09fe76643e47a2cec60a4c1534e88ad3e6830c8d2a9a8c57
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 11376 bytes
SHA-256: 57928fc37d1ff394c2642b5988bbaa31ead9b5aae4412496366f1819dfc6351e
font_02_sfnt_off000127a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3