Malicious PDF — malware analysis report

Static analysis result for SHA-256 6159b0ed06d424f4…

MALICIOUS

PDF

76.4 KB Created: 2021-05-23 17:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4f54c632ae67c346c24f5e033fca830e SHA-1: 821f0ea24ebd44c786523d58089e9828ffa30d36 SHA-256: 6159b0ed06d424f48e676ae95f962918b3516047ba0c9f4b4ac229398851fe2c
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as an SEO link farm and a high-severity heuristic flagging an image lure linking to an SEO redirector. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=how+to+follow+nichiren+buddhism, which is likely used for phishing or to serve a second-stage payload. ClamAV also detected the file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=how+to+follow+nichiren+buddhism PDF link annotation
    • https://vakilonote.weebly.com/uploads/1/3/1/3/131382032/7279880.pdfIn PDF document text
    • https://mebolosedam.weebly.com/uploads/1/3/6/0/136009811/3461703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_60604415da417.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/c28525f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_602f68c53d27c.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/xakapudakadu/what_is_games_theory_in_political_science.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/how_to_read_cross_sections.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f93a53c-31e2-4202-bf85-6dacdf9fafd6/medabevatarikuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be349f8-7059-49cc-a2f2-8664a4a937ac/86700430690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48db0edf-1f22-45c7-9886-4839d10b9133/32028765724.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/8835654359.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/what_is_the_inverse_of_a_matrix_used_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35f11bb-46e0-41fb-a484-d08e24ce6e3c/23359227495.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/nogupafatuwovipofomil.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/echocardiogram_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54f4d7c-8117-480c-bea3-6f61996939de/pedepurimabe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 5244 bytes
SHA-256: 179c9fa552abe2ef9122dc30c28676c6af614700b1f242bcbe6ce1710383ec81
font_01_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 10884 bytes
SHA-256: 447317e6770e1392de31db9bb6e37bb76a112801678fd4b8f05a9c833d0d1620

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