Malicious PDF — malware analysis report

Static analysis result for SHA-256 186130d63c2b8de8…

MALICIOUS

PDF

92.3 KB Created: 2021-04-01 05:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 657ebf94943221deb852a73ba5465db5 SHA-1: 57638d090fba24e709a13ae0a4972d00a827235c SHA-256: 186130d63c2b8de8b3609184c23fc370e86fb6cb81d242d2dba63177443cdb65
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://maypoin.ru/award?keyword=toefl+reading+comprehension+and+vocabulary+pdf PDF link annotation
    • http://moitender.org/symbols_used_in_the_rocking_horse_winneren7c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420039/normal_5fc626f345b1d.pdfIn PDF document text
    • http://moneyindia.site/ejemplos_de_minutas_de_reuniones_de_trabajonr215.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/why_does_my_samsung_washing_machine_not_spin.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/bafg_formblatt_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405430/normal_605c5ab94e394.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/information_technology_engineering_salary_in_india.pdfIn PDF document text
    • http://saruzidoline.22web.org/how_to_make_him_want_you_psychology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410204/normal_6002caadbec16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459941/normal_5fc570db94e0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_ece362d1c75d44869054a5d83f545100.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2d60fd-d581-496f-8839-08fb5f729eae/nursing_diagnosis_handbook_free.pdfIn PDF document text
    • http://lagozim.rf.gd/kigevisunakitepegiwavijut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88ac376-1cc5-45de-b661-82af32f58dda/zaridibuxekuruxude.pdfIn PDF document text
    • http://dupepoge.onlinewebshop.net/75583752478.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/competitive_benchmarking_analysis.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_9be9a4b18f674bec90b1a84577172629.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6abbff91-29f3-4ada-ba10-08805e2cc2d2/asus_rt-ac68u_access_point_mode_setup.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_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 5820 bytes
SHA-256: 7629e0ae0b59b5b9597c25191adbf0e3fb78351c33e72cffcd2df471d933f592
font_01_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 11284 bytes
SHA-256: a0ad56d50fbcc8b012906a5178920cf06cb8a1a84f922802a0e4955d77799917

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