Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d7ed99ea34d23a…

MALICIOUS

PDF

109.0 KB Created: 2021-06-07 13:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b133fbd2f0cc4bce54612bbc86bff53f SHA-1: 0d089588d8ae759c1d7af3d79328346bb6aed83a SHA-256: c5d7ed99ea34d23a090a61910c7c6592f26ff11de7b115b0f24f1b34211a13c7
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of SEO manipulation or potentially malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/pbw?utm_term=biblia+bartolomeu+anania+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492600/normal_6046e76be3e19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_6026260dc2f37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428045/normal_5fca908cbf344.pdfIn PDF document text
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/davimedokametu_wekagamuxex_purudafu_folavosimob.pdfIn PDF document text
    • https://rilitovewub.weebly.com/uploads/1/3/4/0/134095842/goveviturefa.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/pobular_vavatikifapiboj.pdfIn PDF document text
    • https://vevitukag.weebly.com/uploads/1/3/7/5/137506107/nuvemafit-gexaseguvura-fugozutipovamig-rotos.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/9b834a2b2de.pdfIn PDF document text
    • https://zowomotoridaxa.weebly.com/uploads/1/3/1/4/131438570/wepugixesuwis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5fe6b4d89a359.pdfIn PDF document text
    • https://furobafesenere.weebly.com/uploads/1/3/4/6/134626717/rekigelabaw_wezejo_jenugirabosi.pdfIn PDF document text
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/8887718.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/pemobujemab.pdfIn PDF document text
    • https://jelujivaf.weebly.com/uploads/1/3/4/4/134480095/nasiz.pdfIn PDF document text
    • https://gozuvixonoj.weebly.com/uploads/1/3/4/5/134517501/favitudetibinin.pdfIn PDF document text
    • https://jasiximipiz.weebly.com/uploads/1/3/1/4/131453573/zunow-dugeja-juratadaja-fuzakogojaj.pdfIn PDF document text
    • https://didunoduwogu.weebly.com/uploads/1/3/2/6/132682107/de10a.pdfIn PDF document text
    • https://dexexufadojobiw.weebly.com/uploads/1/3/4/1/134109071/batenomop.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/2151c034-f80c-4c56-8d10-aa71fe3bbeda/stairway_to_heaven_lyrics_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fa76a7-0ee3-49b6-863e-cfb2d1d0697e/94417055308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133640b0-7a29-4cd9-8f9c-7a5591187801/95695047316.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_off00015544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15544 5200 bytes
SHA-256: d7aa9f2e27a28779f2b8d9b9e203944bbe8a1ebf0f9358b374b6b3624a559e1c
font_01_sfnt_off000166d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D8 12888 bytes
SHA-256: a283bbf959c1ee973fcd5174c81987b955414f4f1750fc91dbe7b399b199fe85
font_02_sfnt_off0001905c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1905C 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330