Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bc122aa19abdbb…

MALICIOUS

PDF

103.0 KB Created: 2021-06-13 00:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5987b531a8d2923374bbf51b8063b3ce SHA-1: b466c0859779b2a33cd9f97852d3047034b3ec3e SHA-256: 53bc122aa19abdbb5bcd2e671a20cc4533217dda26881156b5e0d35571fba486
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a link farm pattern points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://laborke.ru/pbw?utm_term=kruti+dev+710+keyboard PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495390/normal_5fe0294d82364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5fcfb204d683d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_6056a8eff0299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405642/normal_6024efb3b3d00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_60437a03627a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_6033f1a26b236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_5fd0be49c5acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_6022e5aa352fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467007/normal_602d9ccf2b6e0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4459321/normal_60b3009c164c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_5fdaf8e0f36cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://kepodaworo.pbworks.com/f/25746032272.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144424623/11522464588.pdfIn PDF document text
    • http://natutaliva.pbworks.com/f/jadedegamixufefibowosa.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/zikatukurerunedupesifop.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144824019/the_hunger_games_movie_download_in_hindi_bolly4u.pdfIn PDF document text
    • http://waxijoruv.pbworks.com/f/ndc_engine_bearing_catalogue_2020.pdfIn PDF document text
    • http://nuwiwaweber.pbworks.com/f/61254557146.pdfIn PDF document text
    • http://fijovolumi.pbworks.com/f/tejumurizudegoxagebogex.pdfIn PDF document text
    • http://nugewus.pbworks.com/w/file/fetch/144525078/lunebivesujunezu.pdfIn PDF document text
    • http://debitagemi.pbworks.com/f/last_day_on_earth_hack_ios_jailbreak.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 3840 bytes
SHA-256: 3fece37a86542c5f815575bc2202ce178ea152983eda418e1d7e1a37f09428e7
font_02_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 5220 bytes
SHA-256: a3ca3cfdc64d3c410dcf83060c61002947f05213ddd0c39f36c79de94cfd9122
font_03_sfnt_off00013f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F90 12348 bytes
SHA-256: 2d46562f92c516c6d91feb17ca452430940686b549296292d3c200a7b6c94085
font_04_sfnt_off0001698c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1698C 16184 bytes
SHA-256: eb628873de300591550191b75282a1778fbfa8b3843d76c36828f917309a52a3
font_05_sfnt_off00017efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EFA 3904 bytes
SHA-256: 2d9671a254e3d30a1e613542d7d13869cbae76f8de7cfa52c10c77ff7363e989

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