Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa5321af5857484…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 04:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1697cef82342c665b5cbd6695f84a23a SHA-1: 4cb3797c39a5b6288244c8e8112d9decc5907d35 SHA-256: 8aa5321af58574844994cf82a508cc4dda1175515dfc0ea2a06f684ba7380c70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://hotelharmika.com/assets/userfiles/files/78552413757.pdf In PDF document text
    • http://maszyny.pl/userfiles/file/wewuvomorixuzoduziko.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109070602128289.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210911_9716BADF409B4879.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/fuxugegep.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/wumajikafodolowituvuj.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/75860572978.pdfIn PDF document text
    • http://zenithmetals.com/files/gitowofuduwetifirik.pdfIn PDF document text
    • https://dptech.vn/uploads/files/panuralimudurib.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210902/file/70535037918.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/vonojotuxukibem.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/42053575032.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/75055860279.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/xogededeketej.pdfIn PDF document text
    • https://ismart99.net/upload/files/75744457587.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/89344410090.pdfIn PDF document text
    • https://aaaxxion.info/images/file/39169113567.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/depofedemad.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/16352963709.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/54726810510.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/97716426656.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/mufenexedimovokenaruwir.pdfIn PDF document text
    • http://montesantangelo.it/files/files/51139256273.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/nowatawitirunusuv.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/pezebuvekuniwuvobobodoton.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/waludog.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fee30e229c---13483699539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=military+diet+plan+pdfPDF link annotation
    • 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_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 10312 bytes
SHA-256: b67babd01b68060b00b048b6c799d79665721dcd2ff8d7bf0958ca91bba9b8cc
font_01_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 17852 bytes
SHA-256: 83e23767de5e201d2f1660ff06a82bd4e4cb0c2562658f80a80f6555c4e0501c