Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8c235bdf4f338a…

MALICIOUS

PDF

80.3 KB Created: 2021-05-18 01:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f64f579078385585d387928736b0451d SHA-1: 714d35ba5f6e05d2c641cd361a3be5cdee62bff0 SHA-256: 8e8c235bdf4f338ab6d4a3286f4d87363cc70b34e7c180faf10686088bf87465
156 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, and it contains a large number of external links, many of which point to unknown or potentially malicious domains. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host further malicious content. The document body, though partially corrupted, suggests a lure related to a book title, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=libro+verde+del+ganoderma+lucidum+pdf
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/javatuj.pdf
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/975863.pdf
    • https://beveroseve.weebly.com/uploads/1/3/5/3/135316004/be6f005648a.pdf
    • https://cdn-cms.f-static.net/uploads/4490724/normal_5fdc8b5de1e15.pdf
    • http://xotizel.iblogger.org/4_pics_1_word_level_2268_answer.pdf
    • http://latujor.22web.org/45217142538.pdf
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/5889159.pdf
    • https://datagoso.weebly.com/uploads/1/3/4/7/134718767/748649b48dafe.pdf
    • https://natufebopod.weebly.com/uploads/1/3/4/3/134305275/e2b104.pdf
    • https://cdn-cms.f-static.net/uploads/4456391/normal_601cf1685f441.pdf
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/7163169.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/tisilosowo.pdf
    • https://cdn-cms.f-static.net/uploads/4445325/normal_601eb65560cb8.pdf
    • https://fuwurobo.weebly.com/uploads/1/3/0/8/130814642/pupezas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sepawi/amigdalitis_bacteriana_en_adultos.pdf
    • https://s3.amazonaws.com/dudujopixejikug/how_to_adjust_sloan_flushmate_actuator.pdf
    • https://s3.amazonaws.com/besafefaf/the_dark_is_rising_sequence_order.pdf
    • https://s3.amazonaws.com/sojuravewi/eenadu_epaper_today_sunday_book_padavinodam.pdf
    • https://s3.amazonaws.com/belapawerezuju/14897398369.pdf
    • https://s3.amazonaws.com/zerejibixupav/ielts_academic_writing_practice_task_2.pdf
    • https://s3.amazonaws.com/jokotaziweluge/41352180044.pdf
    • https://s3.amazonaws.com/wejuvono/diferentes_tipos_de_sistemas_termodinamicos.pdf
    • http://tuwafexom.epizy.com/68811170026.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f86d.bin
9f3e592f208753092d1bc26b7dd65852e9cf9842086deb1f6b5f6f609da2bede		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 5436 bytes
font_01_sfnt_off00010ae6.bin
4b2e36e99540818502e9dba313cc7fe52fa594babc0449f2ce964ae844075b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 12044 bytes

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