Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1f939ef770164f…

MALICIOUS

PDF

75.6 KB Created: 2021-04-02 09:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: fb9162a020fe5a78305361d5a0687a62 SHA-1: b12fc9ebdd5424830d695abc1cdb7c89b052dfee SHA-256: 7f1f939ef770164fa7ab329c5c11bae6376b0453ea0dd0c399f4038eee2fc790
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/award?keyword=allotments+act+1950+pdf PDF link annotation
    • http://ergors.space/36866396186oj5la.pdfIn PDF document text
    • http://robinmani.site/88585770080i87j1.pdfIn PDF document text
    • http://varistop.site/twilight_book_summary_chapter_11tleq.pdfIn PDF document text
    • http://ebay-coupon.ru/132890426057k2oc.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/hevhiew/flow_diagram_template_powerpoint.pdfIn PDF document text
    • http://lifeeuro.info/baptism_of_fire_meaning_biblel8mhc.pdfIn PDF document text
    • http://filmera.ru/ziterugijohlylx.pdfIn PDF document text
    • http://tehnotop.space/19734412978b9jcx.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/319f77.pdfIn PDF document text
    • http://ver-alex.website/24157782799fs8c2.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/GjhcVjf/leap_full_movie_in_english_youtube.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/gopolefuk.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/ejeUvjh/43103503442.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/xabajula.pdfIn PDF document text
    • https://rekaxarekarefov.weebly.com/uploads/1/3/5/3/135300852/gimupikiwarumida.pdfIn PDF document text
    • http://avtoshkola-region26.ru/zimojabosigoroz7o89f.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/dr_joe_dispenza_becoming_supernatural_free8j2wl.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/httnlhe/tibotulezupikik.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/33f8efe4-dd24-4d88-be18-73b54dd7a841/how_does_a_septic_tank_and_leach_field_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78b2ca1-d623-4d47-b400-42cf0459d5b2/read_christian_books_online_free.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_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 5668 bytes
SHA-256: fda58367f25e32e3db0757e2458eef0ec1d9e7e4f379237327352b1d06f73862
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10804 bytes
SHA-256: 1f550d3ffac29d4712bdd684ecf2240402d199c1b1894ebaf76745131787b0ef

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