Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8db02f216846b1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 12:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab6f56cda070917974096669dc4b5b82 SHA-1: 0fd3bf2eb8ba7a621a706d29020e41a809ebf738 SHA-256: bc8db02f216846b152af4ef3f4ce1386b4a5c9a20a7ce066fa55d6188364858a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://smidgel.ru/uplcv?utm_term=my+play+store PDF link annotation
    • https://kurtoglumob.com/upload/file/7697767996.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/48792296228.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/44002575955.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/90156376971.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/kagumerewekelem.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/moxiwegukokujoporor.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/4004322535.pdfIn PDF document text
    • https://glozor.com/userfiles/file/71652798676.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d78ab934682de42f30a89777bebf2429/gizozodaj.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/83440378972.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/pulapadorixisizunenugo.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091214480373499.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/29327931712.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/92518159699.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/96830696639.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/92084509910.pdfIn PDF document text
    • http://partnercable.com/files/jejoxusirinadeb.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/wamuvaxagelafovunuwob.pdfIn PDF document text
    • http://schubert-hh.de/image/file/23398538647.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/dasikunepadu.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/64047328261.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/57718209190.pdfIn PDF document text
    • https://educhina.mn/editor/files/8540242504.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/14028118346.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/tabapisebogugomiroriba.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/lawizuzaxitaju.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109140155139002.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_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 17676 bytes
SHA-256: b1eac2319351eabc85c1994d48ee43428fc9366d269c075879816eeeca826cd2
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 10156 bytes
SHA-256: 20c0a76fe03d8730d95ebdb0b596e80067adea8c0a54e14b546cf16d993a9926
font_02_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1