Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4437c002820b03…

MALICIOUS

PDF

73.3 KB Created: 2021-03-22 01:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6cc73d7bd1d8a113811c295e3a0ad55 SHA-1: 634a15f1ca543e43c3f72c785853561404b4d5a5 SHA-256: db4437c002820b0349d37e50b23203ab38d09dc1408ecc3af37d59a40b14753c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, a technique often used for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/123?utm_term=arcadia+group+annual+report+2016+pdf
    • https://cdn-cms.f-static.net/uploads/4368781/normal_6022c5239dba0.pdf
    • http://totalcreditcheck.info/sorowaxunizergzbv.pdf
    • http://familyit.info/daily_language_review_grade_30l2m9.pdf
    • http://trikotoria.ru/52596760431u3zad.pdf
    • http://reactivascotia2020.com/does_apple_tv_have_verizon_fios_app56u5i.pdf
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6050df249d6f9.pdf
    • http://alkim.xyz/80016361qe2b2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wiwuxot/papafilivoveludufu.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/risk_of_rain_2_huntress_item_guide.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_e4d2c3fdf92f400aaa628e24e4c64d9f.pdf?index=true
    • https://s3.amazonaws.com/liluvad/saxadofa.pdf
    • http://rameselutem.epizy.com/adobe_premiere_pro_download_free_full_version_hindi.pdf
    • https://s3.amazonaws.com/likerajatob/dragons_of_faerun_3.5.pdf
    • http://tefolinum.epizy.com/plan_architecture_maison.pdf
    • https://s3.amazonaws.com/mokuwanibof/38189286666.pdf
    • https://s3.amazonaws.com/mubemutolewe/37051738490.pdf
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_1afeb373beab4d098c328d8ac5bfec79.pdf?index=true
    • http://vefuvepux.epizy.com/split_merge_files_free.pdf
    • http://nelaxufap.rf.gd/bibezomonigexu.pdf
    • https://abc5f1b3-ad37-4660-b048-d9bff2240d70.filesusr.com/ugd/a1fb68_27edde40cef6473690089ec83ee01e4f.pdf?index=true
    • http://rozafibadajowo.epizy.com/18591885512.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_8290e6fedebd4cf8b775c5e46f195135.pdf?index=true
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_744ab6dc6e29498abab9b966d4fa69d9.pdf?index=true
    • https://s3.amazonaws.com/wiremeresegikon/happy_birthday_bhai_video_status.pdf
    • https://s3.amazonaws.com/safenalavojuwu/easl_guidelines_hepatitis_b_2009.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_off0000dd23.bin
661ff0f2fb723caf3f04d8215cddd55ad6f52721cbf798d08f61f3846f7f0fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 5616 bytes
font_01_sfnt_off0000f05a.bin
975c84ee56adf4b016c90064596635e6b63e6a32e7d3688161331e1409a9cc3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 11376 bytes

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