Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e7d9186719051d…

MALICIOUS

PDF

82.6 KB Created: 2021-02-27 18:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f1c00763fa50af1cb8bb1841064cc3f8 SHA-1: 0e20ee283a45d4ee815b20efd8a1c596637c1651 SHA-256: c3e7d9186719051d19441bd641061d80b5523b7ff731c24a42ffb54dac69d823
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=schwinn+izip+electric+bike+price PDF link annotation
    • http://vefefex.iblogger.org/wesak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_60390959ee605.pdfIn PDF document text
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/626d5e61d68d.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/87d3acd7c0.pdfIn PDF document text
    • http://roduzida.iblogger.org/best_self_tanner_2020_walmart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_5fd95b0012b65.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/video_celine_tam_america_s_got_talent.pdfIn PDF document text
    • https://kitozegukelod.weebly.com/uploads/1/3/6/0/136056839/tonabajosuju.pdfIn PDF document text
    • http://dosemamorozaj.22web.org/ap_eenadu_epaper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470389/normal_6006867b1f29f.pdfIn PDF document text
    • http://bobiruropiles.22web.org/11132279730.pdfIn PDF document text
    • http://wubegewefek.iblogger.org/41442382945.pdfIn PDF document text
    • http://wazerutumaj.22web.org/warriors_box_set_erin_hunter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_601ff884bd6ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nagasupewi.rf.gd/how_to_remove_the_rubber_seal_on_a_kenmore_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/compile_time_array_in_rpgle_free_format.pdfIn PDF document text
    • http://xuraxanab.epizy.com/best_childrens_poetry_books_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/39255926444.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/61089796773.pdfIn PDF document text
    • http://fodixox.rf.gd/million_dreams_piano_sheet_music.pdfIn PDF document text
    • http://daxararudivoxik.rf.gd/puvodafupigifugoxadotefur.pdfIn PDF document text
    • http://gurevome.rf.gd/59175168549.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_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 5080 bytes
SHA-256: a2ff0a8fdff8d9ff0bd6d73e7f3db2e9b934c7fd1ac0ffc0f52bfbd1fd1558b7
font_01_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 10984 bytes
SHA-256: b812b7ad5008db48f417dbbbce8c2fbf6d20f6bba5173d727fac43c72f1bda6a

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