Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25a31d807714184…

MALICIOUS

PDF

83.6 KB Created: 2021-05-07 20:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f923806f4ee100fa312222cc98b9f021 SHA-1: 4a298e1bfe1eba4ed5a91c0eaee3b33c9dee932a SHA-256: a25a31d8077141844e8d94bba9b2cb51d9a15fbe2782f739beec2ea91e946d08
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://ponafet.ru/strik?utm_term=what+is+the+best+apollo+dirt+bike PDF link annotation
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/1268171.pdfIn PDF document text
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/1671582.pdfIn PDF document text
    • https://divaruwidis.weebly.com/uploads/1/3/4/0/134042650/lumiduporaxejanedu.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/4887020.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/9448491.pdfIn PDF document text
    • https://soridafufunet.weebly.com/uploads/1/3/5/3/135308698/9299519.pdfIn PDF document text
    • https://zipibolusoxa.weebly.com/uploads/1/3/4/6/134627603/3912188.pdfIn PDF document text
    • https://keziputaxa.weebly.com/uploads/1/3/2/7/132711938/jidufedugenanabubawo.pdfIn PDF document text
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/vulekosekiguv-tobij-disekozapiduzul-kubiwuxoretek.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/lesiwanabasajo-regusokiren-wurug.pdfIn PDF document text
    • https://tamegafatukof.weebly.com/uploads/1/3/4/4/134400059/sunodogesiw.pdfIn PDF document text
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/vaditulonomoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_20922533601544aeb6639988f05855cb.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_e8b5823d83ba4e6b9a049355ec893bef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ad74ad-cbb4-4bc7-8d55-ad863e2d8629/what_time_does_black_friday_start_at_walmart_today.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/amadeus_radio_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/how_to_fix_amber_light_on_netgear_router.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/49836378842.pdfIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_a49a4e0c48e14f828dbcfd4b0b069dd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c73845-3b09-4e68-ac05-51c47a7345af/28774851065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb7bf05-5b5d-4ed4-badb-615411e22486/identidades_trigonometricas_hiperbolicas_formulario.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_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 5264 bytes
SHA-256: 2c04741bd0f4f2024fd639d1ed3032a26751a73e3c63c3c822c4548b8c1286a4
font_01_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 10476 bytes
SHA-256: fe293ca3ed48749dc6478538a2c1ad7fec4c3d2456c015f10ccfb7bca82549f9