Malicious PDF — malware analysis report

Static analysis result for SHA-256 908d895c5ed522bf…

MALICIOUS

PDF

74.6 KB Created: 2021-10-08 18:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 007ca9ce995ef01a17e4cd3f9daf5876 SHA-1: 95870962b6537f7eff9cf7c3f210568a4d6fdcf5 SHA-256: 908d895c5ed522bf385e851354a0dfb0a3f3850b4103e10a0a78d36738b8b239
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or redirect users to malicious sites. The numerous links and embedded script point towards an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=wind+mph+to+fly+a+kite PDF link annotation
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/pakemaja.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/48144962579.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/rujiriwogojaxojobudifapuj.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/86301389387.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615616a101d51---99364304991.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/28145596680.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a29044fa89577f7f14ee2caf6fd00284/88741369269.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/natofazowiwebiwepip.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/85898322685.pdfIn PDF document text
    • https://iimranchi.ac.in/ckfinder/uploads/userfiles/files/71851122361.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/tumepubitaxibogikoxavex.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/vimogenabi.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/pabexosexupafugurosodu.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/mevopikixawe.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/fixututemosoxodezuradewet.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/mutijupajip.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/zupodosoxa.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/505810317.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/63108520206.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109050608243700.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/4827217492.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/76680875673.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/novujujewediviporaxidomu.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_off0000c032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC032 17180 bytes
SHA-256: 9b22a93642deb750fee447c93ed0cd53c4c7e54e45e8f9a672f67fcaf45f6806
font_01_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 10692 bytes
SHA-256: 9982e3c2e464c591757b15b736132a1a30168875a14e0590df4833f7fb2602f1
font_02_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1