Malicious PDF — malware analysis report

Static analysis result for SHA-256 39875494dcaa107d…

MALICIOUS

PDF

74.9 KB Created: 2021-05-21 12:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6124b478caf62f7e10a5a400a876993c SHA-1: 2a5dcf5f34f4cc8eae7ade02fd9496fa0d85dad8 SHA-256: 39875494dcaa107dce99757654a9d864637b1660c3ee27be681d9fec716a1b73
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting services, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://golowaki.ru/strik?utm_term=hazard+analysis+critical+control+point+principles PDF link annotation
    • https://mosevulex.weebly.com/uploads/1/3/4/8/134860143/ca2f17dfbabc09.pdfIn PDF document text
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/1751794.pdfIn PDF document text
    • https://popaxeras.weebly.com/uploads/1/3/0/8/130814769/5565351.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/4927310.pdfIn PDF document text
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/xomabegaxesakufin.pdfIn PDF document text
    • https://tekovotobu.weebly.com/uploads/1/3/5/3/135319939/9953523.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/671d08023.pdfIn PDF document text
    • https://wadomojare.weebly.com/uploads/1/3/4/4/134472746/wisumexizajoxepem.pdfIn PDF document text
    • https://midizovusataleb.weebly.com/uploads/1/3/4/6/134618082/tasawer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liguwubore/13768777321.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/how_to_adjust_casio_5208_watch_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe00fae-37a5-4660-9896-cbdd6e1850dc/pisaserusefuluvedevufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a35462-a4b2-471b-8989-bee63ba68612/41267358185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db92f04b-3821-44c0-849d-d6189c00ea95/unit_circle_practice_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed531105-b70d-4d50-b1aa-d58cff834e96/the_revenant_film_plot.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/b._p._h._c_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e90b25-cfcb-4da7-a5c1-f2e867b87b4a/sudoxobasuka.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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5180 bytes
SHA-256: 9973a7af2caa5f4ccbd654177d873bc38662a864cec46f3b7ae518b3188e4a8e
font_01_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 10676 bytes
SHA-256: c043c8827ed0e794e294c9c01b50ddcdfc75eba919739b622a6b76677bbea825

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