Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b54b6f99b750d91…

MALICIOUS

PDF

77.3 KB Created: 2021-03-05 07:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f784931ddeebbcee1bd08fe662d36aa SHA-1: 9123d698b195c17f81f6e5d3a8aea65554b897ee SHA-256: 6b54b6f99b750d919f9e83afd11b161d1d30d5d04c86eaa482a7eff3e7d71c6d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating it functions as a link farm. One critical heuristic identified links to known malicious redirector infrastructure, suggesting a phishing or malware distribution intent. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=how%20much%20does%20a%2050%20inch%20samsung%20smart%20tv%20weight In PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5ff8aeafdd4eb.pdfIn PDF document text
    • https://cdn.sqhk.co/juzexokogim/SqhghbH/26108493911.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/18075992761.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/iaHYjdA/live_cricket_match_ipl_t20_today.pdfIn PDF document text
    • http://suxulopiluv.22web.org/disilubidibenuv.pdfIn PDF document text
    • http://legalevi.22web.org/69058747942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_60068f771fc13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464080/normal_60071a3b328d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425723/normal_5fce79edb3649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_6023d79cb5a59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulupajus.rf.gd/benikizunotusoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777a44d5-85a8-4422-aca3-a01b845f8a14/laptop_acer_aspire_one_722_spesifikasi.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_fbf79b3ae0b245d6852ff3059b6fd53d.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_b3d796095eab4656bc8b01e7af0e4ba4.pdf?index=trueIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_1b3b289130c34bf6986cecbbde1ef066.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a764a32-ec27-4233-95c9-7c416b3a0dd3/the_last_song_full_movie_free_123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3925203b-7e36-42de-8e28-37bb5238ac8b/resumen_del_capitulo_4_de_la_novela_el_color_de_mis_palabras.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_11fa439d8f1843e6bf0bf9bfcf6678a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb33388d-33fb-4729-93bd-0b64c0e1c02c/resumen_del_libro_conde_de_montecristo_por_capitulos.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_a38df349de7544959b40593d30284cdf.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_21a8d89432a44f5f9c0722aedb942173.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_444d895e6e2f42dd9085dc56bbc9ef99.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_2fcda96e8015494387f5bdd9ea11583c.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_f6141cbae2314286996e8dbcbb0f5ae7.pdf?index=trueIn PDF document text
    • http://midekudaxigol.rf.gd/43586807072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f7bf4f-b314-4bce-9612-04bfc473f3c8/is_empathy_healthy.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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 5700 bytes
SHA-256: fc90792b4f94b76016c63c025713fb68c5b8c433567a2c8d30f71238d797c095
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 11284 bytes
SHA-256: ef8d45875abaa460ea030c525f6f9e209cdd96437ff338f98f5d48396d991d02

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