Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32f00df390df9a6…

MALICIOUS

PDF

89.3 KB Created: 2021-03-23 08:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 11d3b10bc155dcbc6c2d4c1187c30449 SHA-1: 870415b8e5dd17f7d75ff228f8ee82afa275bc67 SHA-256: c32f00df390df9a637745a09c95073acf581dfb3e3489dfe9eb9e0e1d21dd34d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=using+and+constructing+a+dichotomous+key+worksheet PDF link annotation
    • https://memudodonimik.weebly.com/uploads/1/3/1/4/131406547/runivoduduf-sotenizagilopu.pdfIn PDF document text
    • https://mizabago.weebly.com/uploads/1/3/5/2/135299272/ronipaj.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/dexunupidotifizuwutu.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/futulizexokexufad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_362d0e2cd664445d967d2edbf5e2c336.pdf?index=trueIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_af385045974d4b64b41074b25ee68fef.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_c4087afc318f46968bea0ab07ad7973d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2c1439-0fe0-4aed-8d4b-44c1a2ac05c8/zesifetimibajobarajijer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bacc27a-c5c7-48f4-ab5e-8adc10972ea4/midimivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15905a1-2b4f-4404-b261-8320ba798d68/kupalupetibikir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe8e6d2-6c09-4c55-a3c5-4d0a53e8f573/19571460640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce306270-2e33-4e8a-ae28-b3623f7add30/81952686556.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_ac5ea917295749f982b21e37fd12be47.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_7925b52f23434c59b84ac01beb930eef.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_9d96033c5413465ab8bc883e21eda123.pdf?index=trueIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_af528a326e91453db0b6705f535a9029.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce1e131-3b02-4f7c-b7d5-44e322595de8/29205250995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca077d7-fe8a-4982-9641-a8e06e649b60/kidde_how_to_remove_your_smoke_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1603e350-0391-4a1f-9acb-19c998a2737e/what_are_the_psychological_principles_of_language_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a7bbcb-6760-4560-abe4-aa6580636bb1/bositoko.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_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 5568 bytes
SHA-256: f9fea0d78e90397636a7e5b3919142f954ef4917053090b9fb99d0497f7916f0
font_01_sfnt_off0001318e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318E 11168 bytes
SHA-256: 9e5a2295254960de45984964377b3d3a34ec6207aef1007023d54f3d6ee06a91