Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9757c75b015f864…

MALICIOUS

PDF

92.0 KB Created: 2021-03-07 10:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a6721624e0adf28cfc4458d06ea45654 SHA-1: 7a2755994fc235d022a1352182ca607b91b7f5f0 SHA-256: f9757c75b015f864889b5bcb768a8787fb7f0b40f70761772162f81b51ba9b4b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'bologen.ru', suggesting a phishing lure related to job inquiries. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external sites.

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://bologen.ru/wb?keyword=is%20quiznos%20a%20good%20place%20to%20work PDF link annotation
    • https://cdn.sqhk.co/kesufetumo/tjaijig/51783841033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_602d2552a8945.pdfIn PDF document text
    • https://cdn.sqhk.co/guzorata/gtjfHja/waiting_on_my_own_song_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/muwunupudi/ggriejj/chess_openings_book_download.pdfIn PDF document text
    • https://zogafopuniv.weebly.com/uploads/1/3/5/3/135390308/56e8966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_6033a52dc2e1d.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/gehidjf/2d_vector_animation_examples.pdfIn PDF document text
    • https://bijafifevidajun.weebly.com/uploads/1/3/6/0/136051066/6021233.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/radumof-dakimewujejano-fewaxema-jemowunimafa.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/ieR5Yhd/juwir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_5fe74dc28c035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5fcb41a0b0e25.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/nereredepixirajativoxog.pdfIn PDF document text
    • https://jisokegapusat.weebly.com/uploads/1/3/3/9/133997819/290950.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/zofagoreminijedivox.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/jii5hjl/pasarenuguverarunuwit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a2c11974-9fa4-45dd-921f-6ae067db657b/roxane_cyrano_de_bergerac_quotes.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/20082216263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/facab700-05e1-4e3e-9df2-06c0a5b8a41e/modo_indicativo_congiuntivo_condizionale_imperativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7032014-8350-427e-9e37-2ee764499690/xilexafonepun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 5392 bytes
SHA-256: 7d5a75df1f86e9f5de038a948552356f17f1368e6fe47c18c9c796f3957571bd
font_01_sfnt_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 11384 bytes
SHA-256: bb05979e4aa83ad473ce2f7561e83ecfcf239c841581dafed6e6f05715bfe41f
font_02_sfnt_off000154c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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