Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e9e30a5e45077f…

MALICIOUS

PDF

83.4 KB Created: 2021-01-24 11:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 697e61d0dc89a20c17b5e9c6eb0b4278 SHA-1: 99010ecd6c72856be6310fecfd91c5fe349f831c SHA-256: e8e9e30a5e45077f664ba18630de88873fa12a14af29c3a5ab5d28b4ae80db8b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One such link is https://seumenha.ru/123?utm_term=tulsa+honor+academy+middle+school. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as Pdf.Phishing.Trojan. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://seumenha.ru/123?utm_term=tulsa+honor+academy+middle+school PDF link annotation
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/7307104.pdfIn PDF document text
    • https://wiwujakibites.weebly.com/uploads/1/3/0/7/130740442/kitaratalatujut.pdfIn PDF document text
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/9342232.pdfIn PDF document text
    • https://pikisavejalanab.weebly.com/uploads/1/3/3/9/133986241/radodunemozekidife.pdfIn PDF document text
    • http://kitufavurakural.iblogger.org/nijigotarelepezerijosewom.pdfIn PDF document text
    • https://denudosija.weebly.com/uploads/1/3/4/0/134017010/fezebufefij.pdfIn PDF document text
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/medixosasog_wofoje_natanabes.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/raxakebo.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/diritusidunupokidub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butaxogusevi.epizy.com/negutuxozelinuzononotafo.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/copy_paste_excel_sheet_vba.pdfIn PDF document text
    • http://zekubegem.epizy.com/63967699251.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/osrs_construction_guide_fastest_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/55260960606.pdfIn PDF document text
    • http://xazitew.epizy.com/73870088646.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/68363733535.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/14065506424.pdfIn PDF document text
    • http://mejavifoxeb.rf.gd/kagulam.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/pantangi_o_pambalana_worksheet_grade_1.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 5228 bytes
SHA-256: 3f69531513ab890dfbbedce931629129b3890bbd1943ee1eec7077dabc4ca234
font_01_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 11128 bytes
SHA-256: 608201ba0bace219cce46be4751f1e7f84470fd774640ce6779f09724c5d8215

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