Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81ce62e58acb0af…

MALICIOUS

PDF

80.0 KB Created: 2021-03-20 08:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bcbd8746b73430f8f2257e51357a15a7 SHA-1: 2c510928b5e186606283f5c0fb9d69c1b65bca08 SHA-256: b81ce62e58acb0af8d0a92d070403ab0b944a1e994c44050d71e0a8bed06a157
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged as malicious by ClamAV and an ML classifier. The document body, though partially corrupted, suggests a lure related to downloading a book, which is a common social engineering tactic. The presence of multiple links to disposable hosting and unknown reputation URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://midufefew.ru/award?keyword=introducing+python+o+reilly+pdf+download PDF link annotation
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/vajunenidegunu.pdfIn PDF document text
    • https://cdn.sqhk.co/juzogimuju/xnhegnc/59592299575.pdfIn PDF document text
    • http://hargotel.xyz/dedofabe6ta66.pdfIn PDF document text
    • https://jugivukovetid.weebly.com/uploads/1/3/0/7/130739525/bedekeke-zuluredetafi-xojesitukivuzo-vanefemakob.pdfIn PDF document text
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/jefevogumizitizuxen.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/5718580.pdfIn PDF document text
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/jisajogepovoza.pdfIn PDF document text
    • https://sufupixugopibo.weebly.com/uploads/1/3/5/3/135316623/bifuged.pdfIn PDF document text
    • http://osmosiotzs.fun/archetype_quiza7tcr.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/x7jggdv/w3schools_html_tags_list_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/iazehbZ/baby_panda_my_hospital.pdfIn PDF document text
    • http://yellownatural.space/download_kart_stars_modimwkt.pdfIn PDF document text
    • https://guxemufisi.weebly.com/uploads/1/3/2/7/132710659/ddb71ff38098.pdfIn PDF document text
    • https://cdn.sqhk.co/wudubure/eXTSicm/real_estate_contract_addendum.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/5767216.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/jekut-mikebuse-gadil.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/4b87ad0c-1da6-4091-a4bf-4476e72d8fe0/runners_world_run_less_run_faster_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da030cc-b00e-4b77-835d-e8918c37a7dd/muwumojojal.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/anecdotal_records_advantages_and_disadvantages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece87e71-5c71-42d6-bdef-283bf25fff6a/33256331699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a9011a-1360-4b18-8826-7393ffa38034/71833876678.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/potemiwujokuborariru.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_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 5368 bytes
SHA-256: 2c3697ca539cbcd2e1ded92c2d8b016b21ff054b9fdb4335d9e0a5ba7a345b4f
font_01_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 10676 bytes
SHA-256: e9c5c213318ac33228b90cfda2152161016ae0f90d9b7ca5a7483468bfbce708

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