Malicious PDF — malware analysis report

Static analysis result for SHA-256 563f329f44a474a6…

MALICIOUS

PDF

83.6 KB Created: 2021-04-04 23:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b768de314bc0378ab6b942c861921cd9 SHA-1: 5784c86235bbb5337c20df549fb38948191ed938 SHA-256: 563f329f44a474a6ad9a546236989a550f68ac36c4f64a73194bf64ca5c5542d
186 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to external URLs, with one identified as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm heuristic suggest the primary goal is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=the+history+of+love+nicole+krauss PDF link annotation
    • https://tupisefam.weebly.com/uploads/1/3/1/3/131383837/17a9f4e715c17e.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/jjjjshe/reversible_reaction_arrow_in_powerpoint.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/iighgiN/word_finding_game_download.pdfIn PDF document text
    • https://nefadojajekewa.weebly.com/uploads/1/3/0/8/130874163/4aae3.pdfIn PDF document text
    • https://refitefajo.weebly.com/uploads/1/3/2/6/132683069/635407.pdfIn PDF document text
    • http://anyita.space/bovefotimuff2tqh.pdfIn PDF document text
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/1a5c6556ed92f1.pdfIn PDF document text
    • https://cdn.sqhk.co/zemakojunil/ibjiLgh/xexupijiwuroxekuroga.pdfIn PDF document text
    • http://ontrade.top/long_and_short_vowel_sounds_worksheeh65xy.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/hiiejjm/kigokeberimuguzemipibawe.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/73c41f0f-58bc-408d-8710-bca25d61a82c/honeywell_t8000c_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5170ff9e-1fc7-46f8-b634-940a2dcf363f/professional_asp.net_mvc_5_1st_edition.pdfIn PDF document text
    • https://334e481f-4595-4613-8514-cf1b68b0f675.filesusr.com/ugd/a5bb32_46d356ce9e024f3d88298a632654c377.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c7eb0c-a565-4ace-91bf-8fdc593f1668/icom_7410_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928c9136-583b-4149-b73b-b84fdd195cc8/jeppesen_instrument_commercial_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658bfa79-a11e-4a99-9de7-e9a3043f537b/contoh_surat_lamaran_kerja_umum_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668017bb-73e3-420c-920f-2893c7e2c9d4/34362914387.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_047cdb1c5f0c496f802b70f354019795.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfbd89d8-a45f-465e-b43b-89c92471ca19/59919141632.pdfIn PDF document text
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_0ca82bda4d324cfa9664c73e02995d37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/505c57b8-cec3-4585-8a24-65bd2dc005e1/82396680924.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_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 5144 bytes
SHA-256: 2e1956b389937f4673ca037d8023400549e06da4037f90c3fa9322a6c46923dc
font_01_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 11852 bytes
SHA-256: b55dbae2783256921640bc3207f90c57e404b2f54a7045d5b83c7513bc962c9e