Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88f47910018c0a5…

MALICIOUS

PDF

74.7 KB Created: 2021-05-08 23:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e20d597787badd2fc6d7ee09c36030e6 SHA-1: 226bdb68b1a75ab922346c230ef43a1ca14d92ef SHA-256: c88f47910018c0a51ca1e08820abbbcdee49a31fce632853ef1450a1b43ca103
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable or suspicious domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classifiers also flagged it as malicious. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=casio+exilim+camera+battery+price PDF link annotation
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/f2a643b67725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_601da650cd078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_604cb77541c82.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/ncert_solutions_for_class_11_biology_chapter_1.pdfIn PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/birusoxokokepuzatag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481409/normal_6056a9b6c8ec7.pdfIn PDF document text
    • https://sozamevojor.weebly.com/uploads/1/3/5/3/135309273/783e5.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/bewejero.pdfIn PDF document text
    • https://visumosibe.weebly.com/uploads/1/3/0/8/130814065/dikagipegolaf_fowitifinifufi_menasifikaj_webedunasevujo.pdfIn PDF document text
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/2605eb84cf80e0a.pdfIn PDF document text
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/7274.pdfIn PDF document text
    • http://fetesitomer.mygamesonline.org/lirubuxedezakojituxawux.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/aisha_chaudhary_book.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/75197232036.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/2c1b3223-0ef9-4dfb-a7b5-489bca9e1ea0/obligaciones_titulos_de_credito_ejemplo.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/nisanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9016c3f3-24d2-42a7-91f4-69ad3d72fb2d/mixoranimodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f997b35-895e-477a-86e8-c83f33a93e2f/1419554847.pdfIn PDF document text
    • http://zulolabopel.myartsonline.com/medical_genetics_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6348818f-83dd-4b7d-a66f-10f51377e0e6/how_to_write_computer_code_for_dummies.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_off0000e6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 5292 bytes
SHA-256: 842b5a2fc163d0b9c8b8cb092c84b464b89ddbed6f572bb2257fe545c923db72
font_01_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 10724 bytes
SHA-256: 350ab300b33645ceaead1701ee28d6366b64abdf2574d516729ede4abf29a646