Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e0dc9ae98738ff…

MALICIOUS

PDF

83.2 KB Created: 2021-04-04 17:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88384872f92381bf82b53ee1de320fda SHA-1: 9472bfd28c11499c2f64d68b8754b98b90abc5fa SHA-256: 20e0dc9ae98738ff1f7621380945439204900977453a05f661f1ed39d3d168e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic firing, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate malicious content, specifically identified as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'Allegiant pdf read online free', aligning with a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/award?keyword=allegiant+pdf+read+online+free
    • https://cdn-cms.f-static.net/uploads/4446158/normal_602724075098e.pdf
    • https://cdn-cms.f-static.net/uploads/4451565/normal_60334a98910d2.pdf
    • http://jajuviramigawo.medianewsonline.com/4598266483.pdf
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/5547707.pdf
    • http://kuzososo.mygamesonline.org/ssb_stenographer_syllabus_2020.pdf
    • http://fisareboveda.getenjoyment.net/english_grammar_tenses_table_free_download.pdf
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/4220756.pdf
    • http://pigetubivefenux.22web.org/cbse_board_exam_maths_question_paper_2020_class_12.pdf
    • https://cdn-cms.f-static.net/uploads/4418191/normal_6049ee1a63f8f.pdf
    • https://putevafim.weebly.com/uploads/1/3/4/8/134881436/fusilidufuwezi.pdf
    • https://gavizixuf.weebly.com/uploads/1/3/5/3/135334805/72eaf2cd5f3b04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zumezeviwakiz/zoxupusupuzodib.pdf
    • https://s3.amazonaws.com/megodipewukitoj/ar_15_parts_diagram.pdf
    • https://s3.amazonaws.com/lomiwexuva/cyanogenmod_13_for_yureka.pdf
    • https://s3.amazonaws.com/turip/gloucester_cathedral_guided_tours.pdf
    • https://s3.amazonaws.com/wajibile/zmodo_audio_not_working.pdf
    • http://tanadumowijilum.rf.gd/16478044649.pdf
    • https://s3.amazonaws.com/pilazi/social_contract_in_the_constitution_quote.pdf
    • https://s3.amazonaws.com/jusuberu/fadawagusowemaw.pdf
    • http://tenurusimuxu.epizy.com/george_foreman_outdoor_grill_amazon.pdf
    • https://s3.amazonaws.com/jukezeluf/8299274261.pdf
    • https://s3.amazonaws.com/xezujuxoz/division_tables_worksheets_1-_12.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_off0000ee93.bin
81dd65e086f45fbf4b6a4b283f06ce4fb3736535cc30845769991394268ed139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 5020 bytes
font_01_sfnt_off0000ffbb.bin
7439b1a88a3da393dbdba3527a7c6c64702bb0cdb0907b3d5cffcc750008bf64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 12356 bytes
font_02_sfnt_off000127ec.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 16312 bytes

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