Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c45b055af8dba9…

MALICIOUS

PDF

77.8 KB Created: 2021-03-10 14:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd49ea70fbc22707681d5aa112744869 SHA-1: 702b7151c45030f843ba98c2eeab046c7289458d SHA-256: c3c45b055af8dba91036355e27945ccc2e40ddefbdbc4453e724b1bba70525e8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary external URIs, 'https://nipisod.ru/award?keyword=zoology+bsc+1st+year+notes+pdf', is likely used to lure victims by appearing to offer academic resources, while potentially leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=zoology+bsc+1st+year+notes+pdf
    • https://kufobuzu.weebly.com/uploads/1/3/5/3/135330794/5947743.pdf
    • http://agent-ritual495.online/hyundai_car_service_center_near_medavakkam98tf4.pdf
    • http://thailandlove.site/the_perfumed_garden_leedstta94.pdf
    • http://dkmz3.club/213364858684lt9h.pdf
    • http://teksalle.xyz/rosiflex_trio_tablet_compositioni3o1m.pdf
    • http://gopidap.scienceontheweb.net/wajolawajitobefagijifim.pdf
    • http://esclick.pro/zadupidixixa9htj2.pdf
    • http://gekodejevotug.medianewsonline.com/excel_vba_function.pdf
    • https://gilulunerokife.weebly.com/uploads/1/3/5/2/135296548/bigusitikotitaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_56ed1f812fae4cdfad25cd4e9c7b8a8d.pdf?index=true
    • https://s3.amazonaws.com/dejazuvorira/daruxilesogusiredonef.pdf
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_00645bef8ae84539b690fa109fe4eaf7.pdf?index=true
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_f173055f66134ad3ac5e418e85c41e1a.pdf?index=true
    • https://s3.amazonaws.com/rubidokezive/wamedajaxululonuj.pdf
    • https://s3.amazonaws.com/fekaduvopigab/cyber_security_policy_samples.pdf
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_0eae349a6b7c4d98bc4b87aba69079ff.pdf?index=true
    • https://s3.amazonaws.com/benuka/45424312357.pdf
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_c9fe9bf3b2d340e3a6338bef9c4411fa.pdf?index=true
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_67e97490b3004daf8975347e68baff52.pdf?index=true
    • https://s3.amazonaws.com/woberiz/tojino.pdf
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_d354e7fa6054407b8305cbfcbd80ca9d.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a8.bin
eab58883716fc7e1d56eb10e80f11b8c3e9674fd9f0a9534d900f3590f36e675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 5576 bytes
font_01_sfnt_off0000f9bc.bin
35c0a746fcdf55e64f2ba55209f6a139fa5d4ea47dce36c63c78d1e6d66b29b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 3204 bytes
font_02_sfnt_off000106b5.bin
7ad2171bbad2b0b0bf23853585c42757240454b96fb7e056b5869830433118bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 10200 bytes

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