Malicious PDF — malware analysis report

Static analysis result for SHA-256 44eebf16576f5cc7…

MALICIOUS

PDF

75.5 KB Created: 2021-05-29 23:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cd0610250d593083f8769abc3fab979e SHA-1: 2898a1b724d932c24382c5a7d304cabc9214793d SHA-256: 44eebf16576f5cc7da30bb3f025cf3303bef10198b1f5485d1ba12e44179994f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary attack vector appears to be users clicking on the embedded links, leading to potential exploitation or credential harvesting.

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://jottigo.ru/strik?utm_term=teoria+del+aprendizaje+significativo+ausubel+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370273/normal_6063c834632dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_60671f6cb9885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_605f6a4138451.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/a8d781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_6050c546b454c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_6041bb298f96b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447271/normal_5ff5c205a6cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_603a4d0d13ab5.pdfIn PDF document text
    • https://gininigexaviw.weebly.com/uploads/1/3/5/3/135350692/eaa27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_60662e2f89cfb.pdfIn PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/6471055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_604e959799e80.pdfIn PDF document text
    • https://gixosakovi.weebly.com/uploads/1/3/4/6/134677645/5471599.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/zagafufumewi.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/e19aae0b-82bc-406f-8f69-1b352409f2d7/sonobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34950b39-3a16-4a93-805a-0561b6b536e1/34676084289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e96aa8-b6a8-4d1b-9aee-cf5f1492eee0/briefly_discuss_the_history_of_islamic_education_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ddab70e-23f1-4a5d-989e-3f58f96486f7/robukinorinakod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ac9022-4048-4ce8-81ac-dd9d178e9a74/vinetulafew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bbb2ec2-bb6d-4df3-b5c8-ef05b91b7bb9/problemas_politicos_de_mexico_independiente.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1fa8c4-ee92-445a-8986-545569fb5270/how_to_create_a_budget_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae30d39f-bbea-45bd-aecf-11413675c4da/james_patterson_alex_cross_series_in_chronological_order.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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 5596 bytes
SHA-256: a1808be9df80792fc7dfffcfd7eb93adb844eed004da2a2a8fd6e59a450d5f10
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 11648 bytes
SHA-256: b6f79ce5cc79879906f947088865952934f24a12eebf9976b019207b8feff193