Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52c0447120e3b85…

MALICIOUS

PDF

93.4 KB Created: 2021-05-25 10:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b3aa9f5943e10a3c7577175afc1e5f17 SHA-1: 5b047188a6947a0fbb08e12b3ddb86ee99313a44 SHA-256: d52c0447120e3b8588905a45397be54ce384c94676e0f9693c85288662d6b560
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one key URL points to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. No scripts were extracted, but the PDF structure itself is indicative of a link farm used for SEO poisoning or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://ponafet.ru/strik?utm_term=tawbah+in+islam+pdf PDF link annotation
    • https://xajaxosu.weebly.com/uploads/1/3/5/3/135304217/2205496.pdfIn PDF document text
    • https://moxeduve.weebly.com/uploads/1/3/0/8/130814104/6750498.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fcbaa03cbcb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_6048e1cca25c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_60152a29638d8.pdfIn PDF document text
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/07e4fe47.pdfIn PDF document text
    • https://kokarino.weebly.com/uploads/1/3/5/2/135299240/venujirex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/diabetes_nice_guidelines_type_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/66262627716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf28255-09f8-4972-93d9-b51ee09e5ae7/overnight_jobs_near_me_hiring_now.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/32286020431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8505c8df-a022-4c06-b55f-3173d9074800/maxi_cosi_pria_85_forward_facing_recline.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/norcold_refrigerator_cooling_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8877ac9c-83c3-4b60-bdf8-156767f1411a/ganajefowulim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331fd772-0cbe-438c-b308-94a51280e54f/how_to_install_fallout_4_mods_without_nexus.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/what_does_ou_mean_on_eye_prescription.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/99747863999.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/31185027832.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000148d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148D9 19672 bytes
SHA-256: a8e58844ba58491507c7c3d1a1374ede25d82aa83eec1cd161824b05b280146d
font_00_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 5368 bytes
SHA-256: f2bb79c0dba6ca33658eac059ec1f75827321b43d39769365c4edfd7a916323e
font_01_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 11976 bytes
SHA-256: 3bcd1c90a6f3b32769ce12311e58fe165e6525b4fed8594f3a0d14653af75db0

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