Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f3d265dbc67996…

MALICIOUS

PDF

76.2 KB Created: 2021-04-01 20:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9a0bb43e034812f03f920c838ca7347e SHA-1: 330c8a0ce17f93076fd9edb7585a58b1d60102ec SHA-256: 78f3d265dbc6799666462b2248dcd83fb485c2feee78100fbec6f47befb6da75
194 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URIs, many pointing to disposable hosting. The presence of 'utm_term' parameters suggests a potential phishing or SEO manipulation campaign. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=epson+ex3220+ceiling+mount PDF link annotation
    • http://wurilozi.scienceontheweb.net/enfermedad_por_picadura_de_garrapata.pdfIn PDF document text
    • http://wdd13.ru/71047618144p16ra.pdfIn PDF document text
    • http://creamspait.xyz/95290701463fonj5.pdfIn PDF document text
    • http://dwatches.site/39106012426r43ah.pdfIn PDF document text
    • http://slmit.fun/coronary_angiogram_report9tvkd.pdfIn PDF document text
    • http://qwertyujg.xyz/how_to_open_trane_xr80eagsg.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/11329375187rok8r.pdfIn PDF document text
    • http://komarovskii.xyz/tuesdays_with_morrie_aphorisms_explained29epd.pdfIn PDF document text
    • http://quickpapp.online/what_is_a_2012_toyota_highlander_worthscc38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_41cad9fe779648d29ce6d725659fef8c.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_2a16fef3fe7c43fab8c8afa8123fff3c.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_53a38991935e4c1d8838239e9bd9967f.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_f2e98f762bb1440d86aaec79c52e4460.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_7aaf9cee1357443bb73bd11dee1f1df7.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_be1e1c0e32a14c8aa064b3b679d324a4.pdf?index=trueIn PDF document text
    • http://tudugir.atwebpages.com/boitempo_drummond.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/citroen_c4_cactus_flair_bluehdi_100_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/76630154028.pdfIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_4c2ed8acb4064362bc6a84d19015a407.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_5f631b44669542b29936ed68c5866e31.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_82673671585f446781c5365db4472b4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jozetej/geometry_writing_equations_of_lines_worksheet.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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 5412 bytes
SHA-256: 85b28814e9e804391987a30f9004ee0e01569625d798ae932ae5552a78cf2912
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 11384 bytes
SHA-256: 81e691071ad1650f78a1137de091b2a845551281282fbab93cb2ba9ab193282c

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