Malicious PDF — malware analysis report

Static analysis result for SHA-256 89316b9e8fc548d0…

MALICIOUS

PDF

70.1 KB Created: 2021-05-29 09:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f4d81ca9149e8ad40ef162a7c1b0c08c SHA-1: 414722041c1143d25539cc28fba6733f545291a2 SHA-256: 89316b9e8fc548d05a16d1e66a9f2f8e3e53c7422a5910b29cb84bfd6be73f98
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 hosted on Weebly, which is indicative of a link farm or a phishing lure. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious sites or download further payloads.

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://gobalubige.weebly.com/uploads/1/3/5/3/135339343/lifuzokiwena.pdf In PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/gotevutomib_faxesepa.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/fcf26b36d.pdfIn PDF document text
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/kigoz-lezolixasijajab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/vAIYpVcV8Aw/wb?keyword=is%20kung%20fu%20tea%20hiringPDF link annotation
    • https://uploads.strikinglycdn.com/files/3a68c97d-9dc1-4915-9b5f-07639c823d7a/88716542602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09da847f-7eed-4367-951c-dd05d7b0ed16/nojadiwup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14171f14-d180-44e5-a092-4aa1b76d8128/nidawixalezoritafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34dcf1e3-0433-4e2d-b4ce-1470a7121719/2015_nissan_versa_note_bcm_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519dd39b-ce78-4a8d-8b81-82234baee092/los_ojos_de_mi_princesa_2_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb0e30a-739d-417f-ad77-679d16d18f63/76561541322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6de8477-3bca-49f2-91f3-acc24a926fea/venta_airwasher_cleaning_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a2cd60-4b9f-4f08-a1af-e31a7cd02014/92373212965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4253768-0f76-48d2-9c68-4edb1232cbfc/56166686706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4f1827-8a27-4887-a0af-31acbad63fb9/estudio_de_los_tres_jovenes_hebreos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae991982-e077-4373-9542-bf996440bc95/68624131859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee944abd-52f4-48fc-81f4-83f05ac7f8fa/13185639602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08f472e-f782-424e-9ab8-25f1c6295b93/90539888759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d8d735-3196-45f0-9d79-b0a9dfcd87ef/dobumexebilikumef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7974a0-75ee-4b7a-9aea-6e2ccdf28047/bafeluvinukeregonuzomaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228f257c-76cc-482e-ac7d-bfc001c6a6e0/catholic_one_year_bible_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31181aee-9b6a-456f-af6e-feef31e36c1b/19131266479.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_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 4996 bytes
SHA-256: a8e1b80674fe1694e32bf4c4029250282f482ed02ea6dfbab1f61f8e0088fb74
font_01_sfnt_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 10580 bytes
SHA-256: fe2d0b9e43c3e1e15c0b4d98022f08070e11f92fe97982211efa33219e8d7154