Malicious PDF — malware analysis report

Static analysis result for SHA-256 9925b96735d73f4b…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 05:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eeb114b38f48682c666e5783fe8a5fba SHA-1: 5b0ecb266e05e533dcfc1f6ca06e094395ad0c28 SHA-256: 9925b96735d73f4beb02d9334e6bb7b021389cae80d819b87522ae338f657e35
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gimoguvi.ru/strik?utm_term=how+to+export+table+from+r PDF link annotation
    • https://cdn.sqhk.co/lovaxixifew/gfN8Uij/rukuzoxumuk.pdfIn PDF document text
    • http://wadopipojadali.iblogger.org/24832756262.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/UPYhiEf/ben_coloring_10_ultimate_alien.pdfIn PDF document text
    • http://keropuxopujeg.iblogger.org/texas_zip_code_el_paso.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/tuV1icC/ww2_us_fighter_squadron_disappeared_over_france.pdfIn PDF document text
    • http://rometinanuk.iblogger.org/quotes_about_school_uniforms_against.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/bjZhj8v/58395352675.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
    • http://lugimes.epizy.com/division_with_remainders_4th_grade_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b239b716-f54a-47c3-a170-4a916605d57c/parts_diagram_for_kenmore_washer_model_110.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_7f053a1c0d764021ab0909145ce80412.pdf?index=trueIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_92ca120297c34fdeaedc4f127178c33f.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_953d2fc2766043c891f3f9cd3cba7158.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7943608a-17ba-4680-b804-fe1b865985dc/53306444200.pdfIn PDF document text
    • http://kitasavino.epizy.com/febrile_neutropenia_idsa_guidelines_2014.pdfIn PDF document text
    • http://pofiwun.rf.gd/8882652554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e855bb87-19c0-4272-88e7-75deffb16995/xorukezanabexuvifunuxu.pdfIn PDF document text
    • http://bepapogijarepub.rf.gd/nokukotidobakawixuxovopin.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_a668df4a2532452fa5869db64d9a98ca.pdf?index=trueIn PDF document text
    • http://lulagewuf.rf.gd/kapokakafebidowove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb7f2a5-0668-42ac-8c8f-d635d206458e/how_to_use_casio_calculator_mj120d.pdfIn PDF document text
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_8416d70cc10145d2b4d9dfa309695c1b.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_1177734b00f64cf6ac68a952e19eb5d9.pdf?index=trueIn PDF document text
    • https://b6d28218-96ba-4f98-b9c1-0d78b4e6fe84.filesusr.com/ugd/47aa88_bd1795953c4b42f9aaad7404e78412d1.pdf?index=trueIn PDF document text
    • http://tametawoga.rf.gd/lexique_du_transport_maritime.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_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 4764 bytes
SHA-256: 966b21c02cef9e07161edbd81d73c930229e8185afebaedbe1d5d87adbd0bbb5
font_01_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 11052 bytes
SHA-256: a323e72823a5cdc6127a300f20fa0667703ca405fc8907c715a52662c0c97c85
font_02_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378