Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1bbdce45d39565…

MALICIOUS

PDF

91.7 KB Created: 2021-03-31 13:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9a302487972b2dff487d9eea1e1e8209 SHA-1: 0ebe5c0b14f286243ffb9843938c5e924f8474b5 SHA-256: ab1bbdce45d39565dd08ad0c60812818750a2d3d3b565b05447aab6ce5c88202
126 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, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious content. The document body, though heavily obfuscated, suggests a lure related to academic essays, likely to trick users into visiting the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://leonvi.ru/award?keyword=argumentative+and+persuasive+essay+examples+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481420/normal_5fecbcffb5508.pdfIn PDF document text
    • http://lagidonak.mygamesonline.org/books_on_sound_engineering.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/dijipibozokoz.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/ajax_creating_web_pages_with_asynchronous_javascript_and_xml.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_6044965822fc4.pdfIn PDF document text
    • http://kemutedetabu.scienceontheweb.net/centrismo_in_italia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_6038166f127a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446027/normal_6009ad7c4f1fb.pdfIn PDF document text
    • http://vukefof.22web.org/kabominufezejetarosuvet.pdfIn PDF document text
    • http://gatorama.fun/labyrinth_of_the_witch_guide1eql7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_6030a4263001d.pdfIn PDF document text
    • https://ruloxewetufo.weebly.com/uploads/1/3/1/1/131164393/e1da699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454558/normal_602220e917eb0.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/1612742.pdfIn PDF document text
    • http://simultaneously.space/zokiponegelofakuwapocd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501204/normal_5ff672cab70d6.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/caaspp_practice_test_7th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_604671fe2f997.pdfIn PDF document text
    • http://sitajejo.22web.org/34110593339.pdfIn PDF document text
    • http://voiprormul.xyz/alcatel_litespan_2000_manuallvrts.pdfIn PDF document text
    • http://6gusevshop.website/xedovekw4s8p.pdfIn PDF document text
    • http://koteyarn.moscow/53978901490cxc65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fisiroxeriwew.rf.gd/oscar_awards_2020_winners_list_file.pdfIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/26763516689.pdfIn PDF document text
    • http://piredesoki.epizy.com/bayesian_statistical_inference_iversen.pdfIn PDF document text
    • http://juruzozesema.epizy.com/sagesugilejosos.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_off00012799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12799 5580 bytes
SHA-256: 2312bdf4914d284b38b361d13385ce41a8e601b1e1b6ac51a294b1a8a245c920
font_01_sfnt_off00013a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A94 11088 bytes
SHA-256: a0bd95791ba85c5a9f7fb339885cf5e7a7e4f433649e3d2d09a6973d35ae4abd

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