Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a712ed51f02a1ce…

MALICIOUS

PDF

86.4 KB Created: 2021-04-04 03:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d4b307fd59c02dea48d7196b67b9e944 SHA-1: 7018d9584baff73a5513e088221be1ad8af47a5a SHA-256: 0a712ed51f02a1ce5b0c5f41e5a8cb8bbf24457ac43257f04420d6174488eedf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm likely used for SEO manipulation or to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external URIs suggests a potential for further malicious activity or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=carmine+appice+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416125/normal_6005f472c8a1b.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/nijugox5lbr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_603e29855496f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470401/normal_6028e1c3cc387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_6021265a35521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_6056ee48ed1b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6034259a62228.pdfIn PDF document text
    • http://seplafond.xyz/monstrous_terror_meaningof3l7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413982/normal_5fe2bdb54c7a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5fed7ed1e97cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_602ace2e72c6a.pdfIn PDF document text
    • http://leqqurint.online/66798199438s7ked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_6019e10851023.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/8c04ae81-dcb7-4586-b64a-1cb5b7f03911/cateye_micro_wireless_cc-mc100w_price.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/bangladesh_video_song_2018.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_e03cd605c9af4a4c92d886c63410f809.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47349e25-8d95-4a79-813f-03444c12302a/87099414968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7494cff-4140-45e2-8e0f-34f73803667d/how_often_does_google_maps_update_their_street_view.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb45142d-a529-40fc-981f-483f0c8a9eaf/how_to_get_3d_warehouse_on_sketchup_online.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_98977b24368c4ad0a43e356a9f0a5d5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kabisebax/sepof.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/anesthesiologist_education_requirements_and_career_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee157915-7485-4fd1-a832-2a6e1146daba/66564304727.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_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 4996 bytes
SHA-256: 7105772daf4336960b8f32c4fd9bf449521a6809aadd1404f87b98ef2a68a330
font_01_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 11976 bytes
SHA-256: ca12192ed606a7ed2800bac55b9c2643e790a305bcb3d9bc88b98354bfaf207d