Malicious PDF — malware analysis report

Static analysis result for SHA-256 f900b07fa5aebac9…

MALICIOUS

PDF

79.5 KB Created: 2021-04-03 23:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 49bc9abc5a0599cbdc363241f03c928c SHA-1: 17a9584cea6ed754364904e331172105bdd5ac69 SHA-256: f900b07fa5aebac9de0deafd11f3d8f677d2381fbcd610a96c564e41485c081f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=greenland+ice+sheet+temperature PDF link annotation
    • http://cosmicgig.com/dibosuqafmq.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/brownie_household_elf_badge_requirementsezhkx.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/d31331d6f270.pdfIn PDF document text
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/mitizalufuginibiwi.pdfIn PDF document text
    • https://tipiwaterexiw.weebly.com/uploads/1/3/3/9/133997214/3971352.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/iaYtfif/vexikekenovudixogujod.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/GihVjbb/josinodulu.pdfIn PDF document text
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/4c70aa1ced.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/pomitaltkh6.pdfIn PDF document text
    • http://pipvip.ru/tatifobudalapevaso36tw4.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/9717353.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/9092182.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/mujevubutukoxu/percy_jackson_3_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/acdc_album_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/98012929419.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_78e06e062bb049bea1dfd1723eec1db9.pdf?index=trueIn PDF document text
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_c9aa58ca56c34f358c33e1c77821d001.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_452a170f277d441b886c5d9ce991d36d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/8224833904.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_f71bdcb737a642cf8d475295e8835733.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/what_is_meaning_of_sub_caste_in_hindi.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_67d76a2688c044a4b42d8b942cf575c5.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_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 5344 bytes
SHA-256: b31b2823c386018db3192678829e57a1ba74b553f6f343057c049da5ee66e976
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 10916 bytes
SHA-256: dc350af0568633008d7354f4387909453da0d020354cefa72659a5ec5bd1fded

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