Malicious PDF — malware analysis report

Static analysis result for SHA-256 18573a8ce2fa3614…

MALICIOUS

PDF

85.1 KB Created: 2021-04-07 09:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3653a293a16387392a770c1e99b3123c SHA-1: 58e1903be9874744f5682440ddb9d02b0a2e2faa SHA-256: 18573a8ce2fa3614bedcd413ddc1c5b955e2546095153772776e34363afa7666
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 0.9994

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://dugedepap.ru/123?utm_term=butterfly+template+printable+a4 PDF link annotation
    • https://cdn.sqhk.co/dogilijesiwu/jhiehpe/lodizivepovimupeso.pdfIn PDF document text
    • https://zeruxitewisav.weebly.com/uploads/1/3/1/8/131856065/01eb0591a86.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/romeo_and_juliet_movie_1996_mercutio.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/iiBjbDm/tank_stars_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/TMvCDLo/bewafiv.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/approbationsordnung_fr_rzte.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/29359209181.pdfIn PDF document text
    • http://majovevalaji.sportsontheweb.net/codices_mayas_y_su_significado.pdfIn PDF document text
    • https://cdn.sqhk.co/joninopi/wgcjaQ5/knife_smash_hit.pdfIn PDF document text
    • http://xonigej.mypressonline.com/what_is_the_big_star_tonight.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/from_inquiry_to_academic_writing_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/DThj6hg/game_dev_tycoon_2_free_apk_download.pdfIn PDF document text
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/timugowezajateb-tageme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rusireges.epizy.com/curriculum_vitae_europass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0385319-1920-4b11-8453-875d57d341fb/what_is_moolam_in_english.pdfIn PDF document text
    • http://radepurot.epizy.com/zojirushi_bread_maker_bb_cec20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a741ba-8c37-44e8-a99f-c99752b8f67a/xidepugotuvaxonapafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9870ce8e-aa22-42f6-a053-3202dbc06806/craftsman_12_inch_band_saw_tire.pdfIn PDF document text
    • http://najiniroxow.rf.gd/7091788717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ccfb066-3dba-4d11-9cc2-1c38a72da68f/lutujeretowop.pdfIn PDF document text
    • http://dazimosanugep.epizy.com/2226054801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb332386-49bb-440b-814b-470054cc9e0a/peacock_jumping_spider_for_sale_uk.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/annexure_e_for_passport.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_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 5248 bytes
SHA-256: 036ffa13cb3b9622ab0a20751a38dc8c19fb02ecdb9d81b9fd37578cd27747ef
font_01_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 11492 bytes
SHA-256: 13c25731783c602b5dddb3699d31e659666c09dec3d36c59792e62810d3db9f0