Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cff23809a264865…

MALICIOUS

PDF

91.5 KB Created: 2021-05-23 18:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 44eed6cfe8d0ec8669d13c1d65eb8dac SHA-1: 31b8318ecdcf454463f5300055099cf83e514206 SHA-256: 0cff23809a2648655894a6a9b3bfe00bb688b82ccca3b98ba2913db1e3877f82
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One prominent URL, https://fokemale.ru/strik?utm_term=gps+gf-07+app+english, is likely part of the malicious campaign. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=gps+gf-07+app+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500877/normal_606e522975015.pdfIn PDF document text
    • https://rakamirun.weebly.com/uploads/1/3/4/9/134904708/4207050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_600a3ad7354af.pdfIn PDF document text
    • https://kidogotetivi.weebly.com/uploads/1/3/4/3/134375399/pudazavibokebeje.pdfIn PDF document text
    • https://sokefumupuzezu.weebly.com/uploads/1/3/5/9/135991751/nosovusijamikesez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_604194fbc2519.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/konimodapiraxa_sifofirefo.pdfIn PDF document text
    • https://lagukowimewalis.weebly.com/uploads/1/3/5/3/135335318/juxalil_zamem_wazepepadugi_ruvakinojumi.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/resisuna/8124806512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db7d99e-67db-4a59-9d2b-bd943a007e23/petujorazikodudaku.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/acute_pharyngitis_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/85871325826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16195efa-bf29-4f8b-9c7a-2855323a3070/how_do_i_convert_garageband_to_mp3_on_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/how_to_train_for_basketball_season.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1828a33e-01ce-4711-998f-558084bb55a7/air_force_1_hi_bhm_qs_black_history_month.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1547e69c-c4e0-420e-837d-2a0ecd2affe6/organizacion_y_constitucion_de_empresas_en_el_peru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bbdc97-da2a-4bd0-80f3-218efdb24e0e/how_to_make_a_technical_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb661a7-309a-49b3-8596-d15f70854097/tampering_detected_please_reboot_vx510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d1fb2e-730e-499f-a47e-67d6386978ca/what_are_good_time_management_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9584fbaf-6b9d-466f-8584-c1a5f446f094/91213868564.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_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 5352 bytes
SHA-256: 5dedcb6830e20382e4a3bc234a8d2293f2ebbdcea7b9e5710c433c2e0c366a2b
font_01_sfnt_off00013717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 12204 bytes
SHA-256: e45fb71b272c453260a75b13373c8abd93cae1560f5bd0225d03f29cced083db