Malicious PDF — malware analysis report

Static analysis result for SHA-256 977ae8a79d05255e…

MALICIOUS

PDF

83.0 KB Created: 2021-03-14 17:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ec1f74d40385b601075e8a6d7f876ea5 SHA-1: 3cd478ef5c339cd6f0f8e261d6efc7a0945df45f SHA-256: 977ae8a79d05255ef181643f960f05bd7bfa380c09a7c708f4ab67ddb13fa9f8
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/award?keyword=urdu+inpage+books+free+download+pdf PDF link annotation
    • http://stepka2016.xyz/narafujrpr45.pdfIn PDF document text
    • http://megantv.site/bonalofesigezyau9.pdfIn PDF document text
    • http://latuha.com/3645204064zl6rr.pdfIn PDF document text
    • http://astropsychology.website/891891940385q968.pdfIn PDF document text
    • http://hackins.site/functional_movement_screen_corrective_exercises5omla.pdfIn PDF document text
    • http://damvglaz6.xyz/pulse_ox_levels_covidzp6h2.pdfIn PDF document text
    • http://3bki.ru/31414385801a9qaa.pdfIn PDF document text
    • http://cardioactiveitalia.site/problems_with_element_tvt89lm.pdfIn PDF document text
    • http://nebo-baikala.ru/would_you_rather_questions_for_gamers88ip6.pdfIn PDF document text
    • http://bilkan.fun/lenisodztsjl.pdfIn PDF document text
    • http://wspring.space/data_abstraction_and_problem_solving_with_java_3rd_ed6jpqq.pdfIn PDF document text
    • http://yozi.store/dagidix3l02f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5fc6b57e69cc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_604137f0c79bc.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/10281043653o127k.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/gowimajemarezitexjn7r9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456166/normal_602f108825467.pdfIn PDF document text
    • http://christinaanddavid2019.com/99694611858o46u5.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/42671580463kbcin.pdfIn PDF document text
    • http://dorightunion.com/worksheet_on_possessive_nouns_for_grade_5ukgsi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486537/normal_5ff6b9858537a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505839/normal_60277645938cb.pdfIn PDF document text
    • http://socialwave.me/20697385046fyik3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab97d18-7851-4e5e-84ad-0f54bec6fc91/65380347381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b062b85-883a-4885-b26a-ebe66433d15b/xorevanopebepotibom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942809ea-cdd4-4232-9a79-556662c04ea9/92533703920.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 5496 bytes
SHA-256: 1861c3437bccb3b8ef7e65859555c577c9f389fb0e3f465349bdef44dbf0b145
font_01_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 9832 bytes
SHA-256: 64f5a79af497ac62c6ba5e905c44c18d2a5b6b3d28cf80ce48e7c6da30be1b8b
font_02_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 19300 bytes
SHA-256: b82d523cd93335b1aa3e142686b5e4330c8a716da2b54a23c17364f19d752282