Malicious PDF — malware analysis report

Static analysis result for SHA-256 57de2704a619f9a4…

MALICIOUS

PDF

68.8 KB Created: 2021-03-10 15:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9acbe6d8557a9a26b7e7b75a338b206d SHA-1: 9fdc13e917dd1ab48c11aeb3c51df71c1545b015 SHA-256: 57de2704a619f9a4af357421539e2c3e1c704a7c873f6c32568c46fcee84ebce
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 0.9998

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://crophysi.ru/wix?keyword=math+2+piecewise+functions+worksheet+%25232 PDF link annotation
    • http://pifumufupes.iblogger.org/53940275620.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/gbgdgeW/easy_metallica_drums.pdfIn PDF document text
    • http://sq11mini.com/aggiornamento_android_lge2kif.pdfIn PDF document text
    • http://toxedajenoxin.66ghz.com/62409255315.pdfIn PDF document text
    • http://1gusevshop.space/noam_chomsky_manufacturing_consent_videokdxel.pdfIn PDF document text
    • http://odemebayisitrafik.com/zolulisememuvoluroviesz68.pdfIn PDF document text
    • http://jiviwizun.iblogger.org/how_to_make_specific_questions_in_research.pdfIn PDF document text
    • http://pshcomonhere.xyz/rifiromumamaewi.pdfIn PDF document text
    • http://fakibukilab.22web.org/38863528761.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/gjidbP0/50206865777.pdfIn PDF document text
    • http://tokio-2020.fun/european_guidelines_dyslipidemia_2019qitcr.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/MjqjdoC/cruise._com_customer_service.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/sGXIgiT/police_lights_2_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/kgf8jdf/history_of_empires_in_the_middle_east.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/ieAjeEU/face_changer_video_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/jasjdji/love_letter_for_girlfriend_on_her_birthday.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_3904816ed1a4425aa69c783fbb5d921c.pdf?index=trueIn PDF document text
    • http://logedulon.epizy.com/a_lesson_before_dying_sparknotes_chapter_13.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_65402ca1e4ef48deb8d6e7f053a74836.pdf?index=trueIn PDF document text
    • http://pekinomigaw.epizy.com/alinco_dx-sr8t_manual.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_off0000d017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 5364 bytes
SHA-256: 07cad57b6066da944d9f0b531914636689e6ff9e28eabb0d7fbb20b161d80ebc
font_01_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 10280 bytes
SHA-256: 2be2df747a3eb7fb416edea27288eb89b3506da6ccc1c4faeb6756bfb96ad7a0

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