Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8b8489f87c801b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 14:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d29fc7bf865428f333ecdafba1ae7edd SHA-1: b82b4cd7ecdd01c17044f188a8cc7f5c6a5e05a9 SHA-256: 8a8b8489f87c801bc8ec64c8cfa512f9e9976c992abf837b589ee0e4eaf774e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through SEO tactics. The presence of external URIs and a link farm structure points towards an attempt to manipulate search results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946eda7e48---vezowez.pdf In PDF document text
    • http://limoride.net/gallery/file/29116023575.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/50517778717.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/pajudos.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/58072004967.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8393cdbc---12696192790.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/90897746686.pdfIn PDF document text
    • http://nemalipics.com/fakimozatala.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/32109870126.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/16953360561.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/11627544043.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/74701752173.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/dujenitixidefefot.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/levaguji.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/sokun.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109130845237579.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/pevonulefogod.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/nejenojuleteluz.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/pimoxek.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/ligitorabipofone.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/dolixazakedelu.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/36831794995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+fortnite+skin+generator+renegade+raiderPDF 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_off0000b484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC96 15792 bytes
SHA-256: 388253e4238a71700ad9f4d86e4728ef0ba2e13ede1281e219b6c8ef12fd26ed
font_02_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 10552 bytes
SHA-256: a405048e715740b6226ec5254bf6f2eeddd29a2d7acd59d9a8c4e28a06ae5384