Malicious PDF — malware analysis report

Static analysis result for SHA-256 b419f250a9c01bd1…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 02:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5cdbccacc8024c471f318dbea01b09f SHA-1: 8bc6d3fe21a450b90c561b08db26e3ae21d7058f SHA-256: b419f250a9c01bd105140dfadf3e3952af7943ec11fa9e8ee4161a5ee5809178
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users. Several external URIs were extracted, including one pointing to a raw IP address, suggesting an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=alfred+home+security+camera+premium+apk PDF link annotation
    • http://alituncer.com/userfiles/file/51995414158.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/dotekawosinefivelajoz.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2tq644s25bvtgffbbnl6rv00m3/fufozajogodi.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/mabunizowuxat.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/39211363212.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0a0c437ab524eff483f374e480272ac4/jejejejitexozexelaxilazan.pdfIn PDF document text
    • https://istanajp.com/contents/files/bivelikobototu.pdfIn PDF document text
    • http://dakmet.pl/upload/kuxipejazonef.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/56597146955.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/pimijonejenarazufer.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210904133218_mpes7b.pdfIn PDF document text
    • http://sciattella.net/images/file/11547559695.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/68141267169.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/31141682465.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/35214515310.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210918_231359.pdfPDF link annotation
    • http://grandioso.asia/editor_upload_image/file/69772053756.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/nibodi.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/kijoj.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/xefujosetumewud.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/49102435355.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/kezimosutefu.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/59181951657.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://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_off0000c1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EA 11068 bytes
SHA-256: 94a46c7be636469d4cda0499daaebc19902360737a0bb53ce1565bcdf4f196ad
font_01_sfnt_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 17880 bytes
SHA-256: 12462ab57961d02c2fe2fc4975e231caf082df6fb43a74f33ba64804cd6ac9c1
font_02_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1