Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdd4ecf418257ed…

MALICIOUS

PDF

72.8 KB Created: 2021-06-14 01:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f3ffa34271fdc10dc438dea7d5171b6c SHA-1: b176c60d4e8a7ea46c9cc5b7241467caed651bae SHA-256: cfdd4ecf418257eda62654eff4f01cba665f8b7af3a7c5fae324e86ce28bce63
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/pbw?utm_term=ece+lab+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368492/normal_603035bcab2fd.pdfIn PDF document text
    • https://leburivirabilaz.weebly.com/uploads/1/3/1/4/131453170/xeriwav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_6010c61dbd404.pdfIn PDF document text
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/a013b8a.pdfIn PDF document text
    • https://befepoli.weebly.com/uploads/1/3/4/6/134687110/xarud-nanibiruneten-xepemefo.pdfIn PDF document text
    • https://wufunuxiropid.weebly.com/uploads/1/3/2/7/132712508/risigodabolej-fekog-duxap-tugutigiwavo.pdfIn PDF document text
    • https://jagefefax.weebly.com/uploads/1/3/4/2/134235663/bisigirejezaporo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5ffdb50b42414.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/pugididokojiman.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_600fb3de2fba3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392218/normal_5ffb330527c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_604cd55cb5b1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_602c65ab36282.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/9668048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kinuwibe.pbworks.com/f/18900661797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24924506-4642-4c41-9b6f-77094ebdff5d/27672241647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db3453be-1645-49c7-94a6-53fd6bda67b0/14356062030.pdfIn PDF document text
    • http://nanefumipopo.pbworks.com/w/file/fetch/144489051/how_to_replace_honda_mower_blades.pdfIn PDF document text
    • http://wigiwopajuke.pbworks.com/w/file/fetch/145017102/80645426461.pdfIn PDF document text
    • http://xuwedateredu.pbworks.com/f/standoff_2_hack_coins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c4a2e1-2f3e-44de-87fc-fa652653f34e/7842947857.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_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 4768 bytes
SHA-256: 41c06022593087844602498ec75070bb63db5950169982e922e8c74644818fa5
font_01_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 10516 bytes
SHA-256: 3646eda316a78bd4fb268c88aa1387c2e8a06687abc85939fda486172a5a47d3

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