Malicious PDF — malware analysis report

Static analysis result for SHA-256 29e90eed892e89d3…

MALICIOUS

PDF

71.5 KB Created: 2021-04-07 09:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1076e66f1f7c7e334f40b3202f20ea34 SHA-1: 849e4087ee17a97f7bc8bddec84602b03fefaf4c SHA-256: 29e90eed892e89d389781467ffb432032a677db37e4fd0fefacb674032c4f702
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://leonvi.ru/wix?keyword=lesson+8+homework+practice+quadratic+functions+answers', is presented in a way that mimics a search result, likely to trick users into clicking. While no scripts were explicitly extracted, the PDF structure and the high number of external links, combined with ClamAV detection as 'Pdf.Phishing.Trojan', indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://leonvi.ru/wix?keyword=lesson+8+homework+practice+quadratic+functions+answers
    • https://cdn.sqhk.co/kerutadit/HicuNhj/nba_2k20_myteam_best_cards_under_100k.pdf
    • https://cdn.sqhk.co/fujalapevame/gdjfjdw/79955759012.pdf
    • https://cdn.sqhk.co/dixejetafap/GEjiGYg/41098640710.pdf
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/705545.pdf
    • https://vurikiwuguwek.weebly.com/uploads/1/3/1/4/131408439/7042635.pdf
    • https://dexisuliraj.weebly.com/uploads/1/3/5/3/135346252/juwemarikukela_rifosifotezej_sadowifakonexat.pdf
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/faxavul.pdf
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/386189.pdf
    • https://cdn.sqhk.co/fabozesemi/jaCOIjc/xomujujakomudisuzube.pdf
    • https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/77e916f.pdf
    • https://saxonolofazejel.weebly.com/uploads/1/3/2/6/132681209/3231f60e2c6db7.pdf
    • https://zujituxo.weebly.com/uploads/1/3/2/6/132681889/nojifeviwikomum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xegiwofune.rf.gd/why_did_taco_bell_discontinue_the_toasted_cheddar_chalupa.pdf
    • http://nilixedenoxim.epizy.com/28145835854.pdf
    • http://livofos.epizy.com/tuxopuzusev.pdf
    • https://s3.amazonaws.com/vuraradaso/bulalagisotolujek.pdf
    • https://s3.amazonaws.com/nijosinizo/esl_advanced_idioms_worksheet.pdf
    • https://s3.amazonaws.com/kiwopusafize/datasheet_nodemcu_esp_12.pdf
    • https://s3.amazonaws.com/befarekogol/lodifibuxasorazolu.pdf
    • https://s3.amazonaws.com/xefejevife/auto_repair_manuals_mercedes_benz.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/bms_sales_performance_australia.pdf
    • http://sadabodavezuzi.epizy.com/69201746110.pdf
    • https://s3.amazonaws.com/xesigeze/sparknotes_hamlet_act_1_scene_2_soliloquy.pdf
    • https://s3.amazonaws.com/bidurudilidujug/63758871106.pdf
    • https://s3.amazonaws.com/niporofez/shinee_five_concert.pdf
    • http://zenisuxu.rf.gd/accenture_aptitude_questions_and_answers_free_download.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_off0000d81a.bin
38aebfc38b2d60a744990aba25d6d4d691d3515715f2235c6177c9b793489ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 5780 bytes
font_01_sfnt_off0000ebb2.bin
4a000a29ace433d0f4811dcb24763ce577bf248c1a8a84c11719931bc29884d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 10724 bytes

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