Malicious PDF — malware analysis report

Static analysis result for SHA-256 7badbf1446b31748…

MALICIOUS

PDF

73.5 KB Created: 2021-02-27 13:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7e3fcb38ea33bfb52c2e4c6381c6e198 SHA-1: a8a3115448afd3655cd75174837b9cc0dc771fb1 SHA-256: 7badbf1446b31748feed9598bb6bb8557f04021dd87208bb9dd3240e17db3d35
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external PDF files hosted on disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to 'Insinkerator manual instructions', likely a lure to trick users into opening the document and following the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dafemum.ru/123?utm_term=insinkerator+manual+instructions PDF link annotation
    • http://rugegav.mywebcommunity.org/sawodigifokosa.pdfIn PDF document text
    • http://manovina.mypressonline.com/sofabarafo.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/zufolabexinuxidazinonadov.pdfIn PDF document text
    • http://autolombardpro.ru/halloween_stores_nyc90kxc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426815/normal_5ff709df6d172.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472488/normal_5ff40c292071e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456671/normal_5fe1b0e2a6664.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/988186383589wont.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_5fda71b0697f7.pdfIn PDF document text
    • http://thestablestl.com/74951159191c2jan.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/ludugafovebewif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368501/normal_5feb51396eb20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483624/normal_5ff55592a303f.pdfIn PDF document text
    • http://topstop.site/riludivagipubizabu8djeh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_602351046bd42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5fe3f322e2b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_602ff615ddd42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/kibirurebowafoxizobifal.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/2107178908.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_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 4944 bytes
SHA-256: 562abaca8a2416ceb308b2d305804cfdb66e148631f5566b42aadca991d7feec
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 10140 bytes
SHA-256: 526ddf3256959ffa44aa8ff0cb4ee7f63e0e2551c853c9233fb5725d81385846

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