Malicious PDF — malware analysis report

Static analysis result for SHA-256 482ed1251406e4b5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 14:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99fa586ce1f9d9866b7e1edb3aab62b2 SHA-1: e96ae12a95fc1197beb17052ca0e623420a5158d SHA-256: 482ed1251406e4b59a1133ef5571617331040585daba6edb6b2de5a1af9314e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'coretry.ru', suggesting it's part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is used to host many links on disposable domains. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=chrome+task+manager+hotkey PDF link annotation
    • http://hnsunnyfood.com/d/files/40356412531.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d5695e88a020c352dc6a372391267ef6/12026193200.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/23789914491.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/74985555818.pdfIn PDF document text
    • https://adci.vn/data/upload/file/zuzulugupukeponoj.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/zedupoduz.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/46165983802.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140e59f0719b---xazogugugunojinopemamog.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/gezatedotitafozubidefe.pdfIn PDF document text
    • http://maulich.vn/attachment/files/81782736445.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0a1af61b---76962066237.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/21924068159.pdfIn PDF document text
    • http://annabarons.com/files/files/72532150474.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/41866549565.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/lotamezaxolibapo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/fujurinuxofipezaroxut.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/62207653360.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/66070388179.pdfIn PDF document text
    • https://eslms.com/userfiles/file/visofotimawisefowuruxaru.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/17765437141.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/49170279663.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/32248791120.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/lotubugigusaxabavukave.pdfIn PDF document text
    • http://juncheng.tw/upload/files/77840888886.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_off0000df71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 10652 bytes
SHA-256: 209d5a15608e1fb4c51324bfc64738a7071e025c204d6f1071c6db2f7d33c817
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 18496 bytes
SHA-256: 5426872683185663b9559802dd86aec169b9c50a41e3470a0b19ed726b280905
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1