Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a0bbad71e55fa1…

MALICIOUS

PDF

110.4 KB Created: 2021-03-20 12:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: de2f6952e30431ea14c7d432ae72c5cc SHA-1: 2e3f545771b82ac137dbed9dd7b2fa68400320c2 SHA-256: 52a0bbad71e55fa1e55c99e604ac29c520953070d5c40d0b9586e012e853ec8d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO spamming operation. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for directing users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/award?keyword=cairo+map+pdf PDF link annotation
    • https://lukawonudos.weebly.com/uploads/1/3/5/3/135320707/benuvov-jadikimok-livoj-votex.pdfIn PDF document text
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/mesominamar_kevabijix.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/febejawas_sipelibaxitak_jofujizejuwosa.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/90964ca9243f62.pdfIn PDF document text
    • http://tujidal.mypressonline.com/13170419671.pdfIn PDF document text
    • http://hookup153.site/mowemowazosbf.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/nafoso.pdfIn PDF document text
    • http://nukicew.xyz/lenolelunukewebeveminakoclnl.pdfIn PDF document text
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/8790133.pdfIn PDF document text
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/6664784.pdfIn PDF document text
    • https://vedudogekikusiw.weebly.com/uploads/1/3/1/1/131164168/dokarinadofe_xitazazapuka_sefojabe_xamidikokokofe.pdfIn PDF document text
    • https://xizadububexo.weebly.com/uploads/1/3/4/5/134595199/megowebabisagozadu.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/6595269.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/favewap.pdfIn PDF document text
    • https://xexofukirusolim.weebly.com/uploads/1/3/4/8/134871283/560a7.pdfIn PDF document text
    • https://tatosemivuzufik.weebly.com/uploads/1/3/4/5/134599987/semebamewenenusiwuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e7ccfc-c2dc-491e-9afb-ffa9533a2c46/bopivujekozida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1207f3c6-6336-494b-878b-f20f9237a8ea/20606873392.pdfIn PDF document text
    • http://poborunedajemo.onlinewebshop.net/94421901712.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000172e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E3 4880 bytes
SHA-256: 15d73a5abd99dc6474516fe6a12329880cc54a1a79970ebbc489a2ecae8048f2
font_01_sfnt_off00018363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18363 11684 bytes
SHA-256: 840f893b79d4ab8638f148f1590f8b8a26f3e6a6a265456fa4209f234adf4884

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