Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb488cc244d8218a…

MALICIOUS

PDF

91.6 KB Created: 2021-03-28 11:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f9e83a96614aa1264a1da03be91173c SHA-1: 94b48707bbb74a158a70bc5ff39acba79e03c060 SHA-256: fb488cc244d8218ad6b0f734c4a7f92c6aab295b50f2afda262e477b5e714de8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the presence of URLs like 'maypoin.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution by redirecting users to harmful sites. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing or content-luring attack.

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://maypoin.ru/wix?keyword=nintendo+ds+emulator+apk+for+android+free+download
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/eb64e82bbad05.pdf
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6021fa59cc14e.pdf
    • https://cdn-cms.f-static.net/uploads/4427274/normal_6023e6d5af10c.pdf
    • http://jsexj.fun/fire_emblem_heroes_weapon_refinery_guideeu91o.pdf
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/8995786.pdf
    • http://katermore.ru/vamedepojowo5eljj.pdf
    • http://antonio-ita.space/advances_in_the_treatment_of_bleeding_disordersex28x.pdf
    • https://cdn-cms.f-static.net/uploads/4383321/normal_600ddb21f2c3b.pdf
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5fc75e13b73c5.pdf
    • https://cdn-cms.f-static.net/uploads/4366344/normal_60220b8d829a8.pdf
    • http://bachanalytics.com/petting_farm_near_me_now43all.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fatisake/any_way_you_want_it_sheet_music.pdf
    • https://s3.amazonaws.com/baposivarabuj/game_of_thrones_book_tv_comparison.pdf
    • https://s3.amazonaws.com/dezajok/what_are_the_sex_offender_laws_in_illinois.pdf
    • http://fisuzes.epizy.com/83805340332.pdf
    • http://kewuzelaxapog.rf.gd/kenmore_mixer_attachments.pdf
    • https://s3.amazonaws.com/xofalepelala/what_is_critical_reading.pdf
    • https://s3.amazonaws.com/lukepepe/relev_d_emploi_en_ligne.pdf
    • http://gisobugiwe.rf.gd/jurnal_blastula.pdf
    • http://vetizonudaxow.epizy.com/abbyy_with_crack.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f332.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 6744 bytes
font_01_sfnt_off00010417.bin
f43aadf8845896f9d33d34e86ed639b22cc41d16c0726595b34ac0d81581ae70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 5312 bytes
font_02_sfnt_off0001161f.bin
dfa191ac1abd2fe9e1531dee19a3c659e06ab819986d41441fa4c7e0fcfccca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 4440 bytes
font_03_sfnt_off00012205.bin
dc081e8084d86e83e5e27a39c3aeffb249eca87c4e4a81ae1cc616a8f36db6d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 11508 bytes
font_04_sfnt_off0001489a.bin
1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1489A 16140 bytes

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