Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb247cfab14f019…

MALICIOUS

PDF

73.7 KB Created: 2021-03-18 06:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0b1202f28771e6cf6740b54c22c9682 SHA-1: 1782ebc6b2fea8b35b384c9d944d42dc4c5d81b9 SHA-256: 9fb247cfab14f01978220c7e44759f7f9ee6015a2b87ab1da67687a19c4b48e7
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://golowaki.ru/strik?utm_term=common+core+state+standards+wisconsin+social+studies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5fd92ab938e60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426080/normal_602820d0ea9b2.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/difudixilal.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/haLjjTx/usher_songs_2019_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fatepotax/aFhejeq/navujaxowuxekoju.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/4057863.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/siwalagonovuwadas.pdfIn PDF document text
    • https://cdn.sqhk.co/winibitorut/ig5gcid/disudasidopenolipetiwapix.pdfIn PDF document text
    • https://cdn.sqhk.co/gedofovel/bsepjjs/city_drift_game.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/5jaGXjb/bollywood_latest_movies_free_site.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5fe9f09779691.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478716/normal_5fedc98599404.pdfIn PDF document text
    • https://fekifefexil.weebly.com/uploads/1/3/0/8/130815726/4456750.pdfIn PDF document text
    • https://sagaragevuba.weebly.com/uploads/1/3/4/6/134685912/2b5f2e12b0ffa22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/zalabevabovos.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/54921027223.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/lobisidufikofuxatewuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/mubokitepigilovid.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_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 5080 bytes
SHA-256: 12c551352497df904e85a88b01b9e4ac77cee042484688b38f19608e947630f5
font_01_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 10420 bytes
SHA-256: 9163845b03f6a604a55ad68daa10307f987c2b213fde5fa435a235ce36f66a52

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