Malicious PDF — malware analysis report

Static analysis result for SHA-256 830db79d9b3161f7…

MALICIOUS

PDF

80.8 KB Created: 2021-05-10 15:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c21fd4bf1909e158f914244ea62ba8e9 SHA-1: 2aeaef14e87c5a6b2ad4f390e125353b565a7bb5 SHA-256: 830db79d9b3161f7e6137e124b27b0078575ee23e9a9ac064eaf56b550400a57
186 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs, particularly the one related to product value searches, point towards a phishing or scam attempt designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=how+much+is+a+samsung+galaxy+s9+plus+worth PDF link annotation
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://suwisabinupa.weebly.com/uploads/1/3/5/3/135351097/wabupejo.pdfIn PDF document text
    • http://chategratis.online/538711062vpud5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ff6add2bb012.pdfIn PDF document text
    • http://chtotakoeverti.biz/53078313297e80ir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fdf5e2c48c86.pdfIn PDF document text
    • http://wordwild-store.com/55534708762v0z20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365546/normal_60075381d2f1f.pdfIn PDF document text
    • https://netigiru.weebly.com/uploads/1/3/4/5/134501210/zisizex_pawaw_kogijep_rolurok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_2bec78bb10dd46da86f7d993edab6e92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8368f8-16e1-4c7d-9b5a-f5cf5e861ad6/cateye_strada_slim_wireless_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6309226-4dda-481c-bf1f-297d04e8dbb0/the_key_moment_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da2b20f-57b6-4b4f-9b69-f72a3e256978/what_is_correspondent_inference_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2e9d9b-c09c-4ebc-9acd-855b611c6ccd/bissell_proheat_2x_deep_cleaner_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff499006-b9df-45f5-b684-23d80a1b8054/lepevulagaxixizep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec81a09f-f73a-4f85-b728-256e40ee06d3/4e_dd_classes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e141f4a8-19b0-4952-9b42-3c2125b9c10b/nabolijuvubiruxedudije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae226f25-2d2e-4dfd-96af-0f8f81cd5569/how_to_update_apps_on_lg_smart_tv.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_6bd5f3e4ac4244c9a3f4e8142012959f.pdf?index=trueIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_d50776b176184510974527af8d0528a5.pdf?index=trueIn 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_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 5724 bytes
SHA-256: a2c73c84293dd6e02e5a58781041eec23fec686ac6ccd498b4b329bae591cc6b
font_01_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 10860 bytes
SHA-256: b47ed23c3a63c5a47f15d3e1a41923d2e8763e1b06e346591da2564a2cf88016