Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcd2b0a7a8e0450…

MALICIOUS

PDF

71.3 KB Created: 2021-06-01 03:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f813aaa228f260eba56fb8468b639f52 SHA-1: 33c46d999decb829e3a13dab7cc73ad7bf663877 SHA-256: ddcd2b0a7a8e0450e921a0077d24e3f24ae23099795815a7b7f0632ae2593ca8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=best+way+to+rank+up+in+halo+mcc PDF link annotation
    • https://giledaxije.weebly.com/uploads/1/3/4/3/134312043/8182272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_601bcf44e3641.pdfIn PDF document text
    • https://nadazeva.weebly.com/uploads/1/3/4/4/134499610/1800046.pdfIn PDF document text
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/laduf_fajoz.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/vejexawarafufiz-bulafuzazitato-xebugezosew.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/lunomujonagenur-tekafukegegiw.pdfIn PDF document text
    • https://piwetidij.weebly.com/uploads/1/3/2/3/132303123/luxijafa_zepeninalum.pdfIn PDF document text
    • https://nawigabijaku.weebly.com/uploads/1/3/4/5/134599080/5462979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_6030939c8563f.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/purozidali-jefija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_60208d4ded223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fe47080437a5.pdfIn PDF document text
    • https://menegelobeka.weebly.com/uploads/1/3/4/9/134903334/lolipunonivuzajun.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/8349076.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/fasesipugewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_602736faa680f.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/19dc4761-21af-4549-b2dc-80ccbb712c30/xujiwawezaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f9ffd0-c666-4851-bbbf-1b3fe3095e5a/interview_questions_and_answers_for_nursing_supervisor_positions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bd302c-9451-47fc-8ab6-9c6efbb5eff2/99714552378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c7af9d-8c27-4f9f-b444-bb255207df23/17776207258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d32081e-0e87-40ff-b74d-2c6668e2cf33/98666261054.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_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 5480 bytes
SHA-256: 77f851a975ed405689d076a1cd90486d570c114070b17e90fbf32ef1c2a55136
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10264 bytes
SHA-256: 75c11c65f3ddbbc692c61e84cfc07c406b0d970eba5da1d36066faccf05ebfb5