Malicious PDF — malware analysis report

Static analysis result for SHA-256 42258b9c0d0e0226…

MALICIOUS

PDF

78.4 KB Created: 2021-02-08 18:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ee77b9b624acccb7ed9906068568f04b SHA-1: 2d36e8e1cd91b9a3ffdf62166215796db44eeee7 SHA-256: 42258b9c0d0e0226e6d78419e3b8ab63f61701e4ed84f78710d7ed3a13f2ac5b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text suggesting it is a 'complexity of algorithm cheat sheet', likely a lure to entice users to click on the embedded malicious URL. The primary IOC is the external URI pointing to 'baarspo.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/aws?utm_term=complexity+of+algorithm+cheat+sheet PDF link annotation
    • https://cdn.sqhk.co/momajuxu/bjgjcV0/48484604144.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/8hhwl7E/kupoxigizobipesot.pdfIn PDF document text
    • http://gachihyper.xyz/trw_stone_wizard_free_download42b89.pdfIn PDF document text
    • http://cosmicgig.com/carlow_county_council_housing_application_formrolhz.pdfIn PDF document text
    • http://legrand-spb.ru/calderas_peisa_duo_manualylsz2.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/gfEiieX/jiseruzusubineguwiju.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/dFcheih/costume_store_midtown_atlanta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376878/normal_5fe5c6ac6e76c.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofoziga/4Zj99Cz/rasafumexumikujipu.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/aIrcje8/octopus_plural_possessive_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386335/normal_5fddd5a57905e.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/BCqcijv/offline_language_translator_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/DjjTjeQ/zokesajurudasukoran.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/ijuySgc/italian_love_songs_cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/wallpaper_god_krishna.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/blackmail_odia_all_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/zevubolekokaxakagu.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/29586916296.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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 5504 bytes
SHA-256: eefac9ba1293a52387054eefe9a8b011281e8243ca58a83906f3b0ca9f28c254
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 12120 bytes
SHA-256: 935fdf496224bd79cb30391b5cbec61562d528257c48b94a52cd55404830f547
font_02_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

Open this report in the interactive analyzer, or submit your own file for analysis.