Malicious PDF — malware analysis report

Static analysis result for SHA-256 37707f1b548826e0…

MALICIOUS

PDF

81.9 KB Created: 2021-05-11 21:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 60542947d0cea7e6785878707e27756e SHA-1: ddf3c5031afa32bfa6acdb0b2d73b1aae0cc2f61 SHA-256: 37707f1b548826e005a1f05c37f82d31123307625c0cd18dd91eda70bfbe97d1
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://leonvi.ru/strik?utm_term=age+system+rpg+stunts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495997/normal_5ff392fa56429.pdfIn PDF document text
    • http://gigezesuzobe.getenjoyment.net/social_media_marketing_company_profile.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/gdifif3/bbtan_by_111_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_604b7f51c5b29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403557/normal_5fe569bb0daa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_5fda6bcfcf35b.pdfIn PDF document text
    • https://cdn.sqhk.co/xetilibul/hif9ED5/bff_friendship_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_60654adcdf589.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/jzsMIO0/knock_down_door_frame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_600e770ec6d2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500895/normal_5fcdd225b5d11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423430/normal_5fe3c3bfe6839.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/68738833171.pdfIn PDF document text
    • https://cdn.sqhk.co/rebiguta/JjeXcii/65026124854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dirazonun.myartsonline.com/70886216864.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/beatport_top_100_s_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46853978-8ea2-4e16-b198-efb3d6371f2c/fe_exam_dates_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad48dd46-9e57-41d4-81b5-e987f17f606d/roman_mythology_stories_animated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03eb5568-d4b8-460f-ad3c-0d8a87a11e20/theory_of_knowledge_according_to_immanuel_kant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f22c61-7905-4904-9a15-06163e142e61/12262641637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cb1209-db9e-4d5e-b712-060ff9a02092/what_can_i_name_my_black_cat.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/39718434927.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/kenmore_800_dryer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/1495369002.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_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 4988 bytes
SHA-256: 142c843e1c33ee91ef508352d4fd5c37dcd443a726088c2015970e6be6f83ef4
font_01_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 10460 bytes
SHA-256: 31c221327d0c05fa11756b88549945d631d6dacead00beda8a9c4d59a694a018

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