Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a5292d079ef5e6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-10 12:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5b45415bf11b17e5be939caf0f50dc85 SHA-1: b789da43cfe5feaa252beae16045b396b1316b1c SHA-256: 56a5292d079ef5e6ac37d269e85e502bd02ad47b83c4d15689b4361d353b709a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one identified as a link farm on disposable hosting and another pointing to a URL with a 'robux free' term, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the links suggest the PDF is intended to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=robux+free+rbx PDF link annotation
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/banenobilaresusakosivasa.pdfIn PDF document text
    • http://hiniceshine.com/upload/2303795540.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/vigonugijijuzedasewil.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/93281902874.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/dikikepenez.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/dikokuxewepopuwaru.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nineguj.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/89689207867.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/pinetefejamowina.pdfIn PDF document text
    • http://thefencedocumentary.ca/adminfiles/file/ludek.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2d0obb8m4rhmsu77d0lr5nbb94/20112654745.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/4635077210.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/14788235580.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/97775937474.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/97271999618.pdfIn PDF document text
    • https://dhesient.com/media/xupikofefiv.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/91636514484.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/39885256311.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5083938528.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/12544122566.pdfIn PDF document text
    • https://timminsrenovations.ca/file/GNAUluRAaouGW9Rd.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133faf477590---betupidijulodu.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/78068107300.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/3643496505.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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 9924 bytes
SHA-256: 27deb468898d774832720d97092ea67c29f30626447d6fbc1c7d86bf2f2068cd
font_01_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 17320 bytes
SHA-256: ea4e535b64fec11ebe5c58bb805dd604a58571e4d45dddab0643a748892174ff