Malicious PDF — malware analysis report

Static analysis result for SHA-256 e858d920afc62ad8…

MALICIOUS

PDF

77.1 KB Created: 2021-04-12 19:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f5a7f743f21c892ded397c4d2fb9fa0 SHA-1: d0ec5942ada8ebce7d1b6fd00f5b0ea6748f709a SHA-256: e858d920afc62ad8fc5b034211ac015e8048553f7a7bfbf075eb3c5e4e1509a7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary malicious URL being https://ponafet.ru/strik. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further payloads. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=moon+phases+worksheets+4th+grade
    • https://cdn.sqhk.co/virurewev/cNgigNP/life_is_strange_before_the_storm_farewell_choices.pdf
    • http://rejinijajelu.22web.org/29556983312.pdf
    • https://cdn.sqhk.co/nilesatu/ieugige/does_he_like_me_or_not.pdf
    • https://cdn.sqhk.co/fokofike/gck3li3/19059110854.pdf
    • https://cdn.sqhk.co/xarozowuzosa/MRjiifz/kidifekodomifawi.pdf
    • https://cdn.sqhk.co/xejudawadoni/fCdxiar/mikejusozitosa.pdf
    • https://cdn.sqhk.co/ruvatagukas/fibhcpz/60157019154.pdf
    • http://manaxupupili.iblogger.org/how_many_books_are_in_a_set_of_encyclopedias.pdf
    • https://cdn.sqhk.co/powitaxixu/fifmntr/dungeon_x_pixel_hero_vip_apk.pdf
    • https://cdn.sqhk.co/tusenepobam/jthckhf/palagaditutobi.pdf
    • https://cdn.sqhk.co/vimitewimuwi/ydigif7/vusukavekepowanik.pdf
    • http://xovijezup.mywebcommunity.org/nilofosiwefabusuzevalaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f34db268-07e0-4f14-9067-c4df05f79e6e/dejopobotodi.pdf
    • http://fokerek.epizy.com/easy_origami_box_with_one_piece_of_paper.pdf
    • https://b36ad067-21ef-4b17-9055-1dfcbb3fb98c.filesusr.com/ugd/8673ad_c840a6e2e945480aaa8daa5e6be2d657.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f899e3e-1027-427d-8a06-3f79266c46ef/kosewigozavu.pdf
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_28a49bd03c0d48239971e7eddc077089.pdf?index=true
    • http://supuwevul.atwebpages.com/bhagavad_gita_chapter_4_slokas_in_english.pdf
    • http://pozibeborajifo.epizy.com/zidadubijisitabi.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_off0000effe.bin
9612a9ccf895a4fb1e65348ed94523ad29ee1edb272077f1d1ec4bcbbce2dd42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 5440 bytes
font_01_sfnt_off00010298.bin
1fcf5f3e8c6cd1223f7b5c2f23b158757abc596ea6e1a8aaeca4a0b49fb1c6dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 10684 bytes

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