Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ed4b8c57d58fb4…

MALICIOUS

PDF

94.7 KB Created: 2021-05-25 12:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5fd4f2d8e5f6ae8f076b071ececb2e5a SHA-1: c3bbc7acd5f3e87621d1d19135f611a583b277a3 SHA-256: b5ed4b8c57d58fb4b7dafc4ef41af4f8466d74a2e13b5189ccc59c8e22fbba05
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains, likely for SEO manipulation or to distribute further malicious content. The presence of external URIs and a link farm heuristic strongly suggests a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://zajinet.ru/strik?utm_term=is+breath+of+snow+and+ashes PDF link annotation
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/6560169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_6015315ed56c2.pdfIn PDF document text
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/devevaxa.pdfIn PDF document text
    • https://nirixebuwema.weebly.com/uploads/1/3/5/9/135990662/bapotadoxub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_603b2652cfbb4.pdfIn PDF document text
    • https://dofipoxadule.weebly.com/uploads/1/3/4/3/134314370/nivaj-vunozi-jugoxomafolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_603e324610695.pdfIn PDF document text
    • https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/7f318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_60468bc47599b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_6028574a4e4f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_6015b93a2f2c4.pdfIn PDF document text
    • https://wexotagupoma.weebly.com/uploads/1/3/2/8/132814474/5642673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371791/normal_5fde904b2f945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_6008a4d34a3c8.pdfIn PDF document text
    • https://matelusa.weebly.com/uploads/1/3/1/4/131406649/palafupisolefado.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/moferut.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/47e2cab1-8f9f-4944-b5b6-0b9b234dd657/binatuzadadavoj.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/37049891957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f848535f-5e6e-40fc-98d6-9ac0461ac1ed/54150391999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de2a7e4-57f8-4a7a-a320-c9479c98c2ee/graco_pack_n_play_care_suite_playard_assembly_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/rocket_chat_desktop.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/big_data_management_technologies_and_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad97a6d-81d8-463b-92ee-66eda7014ab5/will_there_be_year_6_sats_in_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/html_href_not_working.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 5132 bytes
SHA-256: ac1a0829bf74a0321aead9154384f0bde214db847c985b43e1ab7f21bebed742
font_01_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 10872 bytes
SHA-256: 8fea85073b464225ac18519dcf46dbdfdd9bc34c475ea0c75ff71127430b9f48
font_02_sfnt_off00015842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15842 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330