Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a09facf7834105a…

MALICIOUS

PDF

83.0 KB Created: 2021-03-30 01:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbd3bead1963d6eaecf176fb7c501f6b SHA-1: ba8aaf2f7615aab8035b196afdc66622a571f00a SHA-256: 2a09facf7834105af97e57ba68de45e4888b1e61b9d7a4b496423446d254c5e9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to inflate search engine rankings. One URL, 'https://zajinet.ru/wix?keyword=surface+area+of+prisms+and+cylinders+worksheet', is directly embedded and suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=surface+area+of+prisms+and+cylinders+worksheet
    • http://nekidifuton.medianewsonline.com/english_crossword_puzzles_with_answers_for_class_7.pdf
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/rapejemuvunowupuzuve.pdf
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/4398428.pdf
    • https://lomamunapud.weebly.com/uploads/1/3/5/3/135315780/pivujotajet-mefidufiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bopisumeku.atwebpages.com/la_cantatrice_chauve_scne_1.pdf
    • http://zobozigeg.epizy.com/defining_relative_clause_exercises.pdf
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_65e4ffb6d1544c3d90a76cde1e61cc0c.pdf?index=true
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_237a9bbccdf84b85977738f80efa252e.pdf?index=true
    • https://s3.amazonaws.com/lixasifasi/nightmare_cinema_2018.pdf
    • http://kunibenurupamiv.rf.gd/vinidavorililomexuxuzipo.pdf
    • http://tafinefonekon.rf.gd/jitokup.pdf
    • http://pimokizogo.epizy.com/cours_de_traduction_anglais_franais.pdf
    • http://lipubumili.epizy.com/washington_football_team_helmet_png.pdf
    • http://deravamosu.rf.gd/theory_of_capital_accumulation.pdf
    • https://s3.amazonaws.com/nuxulikiwab/lowercase_g_tracing_worksheet.pdf
    • http://todafamigetoj.rf.gd/tawofizuvapiruw.pdf
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_0bedbae15f944a37b823b870eb1ba4fc.pdf?index=true
    • http://sewoxoxitif.rf.gd/forma_de_gobierno_de_chile_2018.pdf
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_a5990caeccbd44e68627813d23042a25.pdf?index=true
    • http://keregimuw.onlinewebshop.net/foxil.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca6.bin
40426e3315a378bd0476d9d3a796561c7e6de0c24ea50904157c94e9b2c18962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 5756 bytes
font_01_sfnt_off0001002b.bin
65f37636e65982846f11b8b0751f2fd8949db94ee226a83edb7a92353252c207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002B 12172 bytes
font_02_sfnt_off00012990.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 16060 bytes

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