Malicious PDF — malware analysis report

Static analysis result for SHA-256 1128cafbd6ff2190…

MALICIOUS

PDF

76.6 KB Created: 2021-04-11 01:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 93fa48460b6fda3e9cef50feea2071a8 SHA-1: de13404b48e2c0e2ece5089265378406b22b870c SHA-256: 1128cafbd6ff21907f99e7d363e4bf219b96fdf89d23532b3e780bee3a3b1175
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or SEO poisoning tactic. The primary URL, vilenefex.ru, is presented as a search result for a specific query, indicating a lure to a malicious website. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=ancient+greece+map+activity+answers PDF link annotation
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/4232386.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/raxekof_lirabojakalezol.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/jaSMphc/doot_doot_skeleton_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_602907d6ce4f6.pdfIn PDF document text
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/funalivafiwuluk.pdfIn PDF document text
    • https://cdn.sqhk.co/zaniridut/e7jfYKP/versatile_tractor_dealers_in_arkansas.pdfIn PDF document text
    • https://xakewalite.weebly.com/uploads/1/3/4/8/134882175/3944460.pdfIn PDF document text
    • https://pevamuwewewi.weebly.com/uploads/1/3/4/6/134636281/sevesuf-xojorur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427273/normal_6035db3e65c99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejados/37271979375.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_e483ac426cc941719062f7fe0a8a4afe.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_eec3cd7f21bc437d97280bbbe89058a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f47475d-552d-455b-9b14-58275dd335d9/how_to_make_cake_in_ifb_convection_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/limits_of_composite_functions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/galciv_3_intrigue_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/84076116491.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/nufoliroxodize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f16441-31ad-4cdb-a337-4f5cde7061d2/todolomosi.pdfIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_4158ffe065e24bb085ad3137a6228cef.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_17285844820140a7af179a45ad00021d.pdf?index=trueIn 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_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 5464 bytes
SHA-256: ce09e79c12f4e1449e5a71970fcbb57d2b700a656fd6527b3d43eef96b1a6240
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10408 bytes
SHA-256: 18dca5f1a1fc09c49335dc2f008e5384310c14da77b94797f2a5daa1e841011c

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