Malicious PDF — malware analysis report

Static analysis result for SHA-256 a510db659f8c1839…

MALICIOUS

PDF

74.9 KB Created: 2021-03-03 02:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 96b68eeb9a7855efe8cde59ccc12a9e4 SHA-1: dfc51cb33d3be87479d19a2f494725a7a0808b13 SHA-256: a510db659f8c1839ff5b222446aab1a21c28c8a67d6634fabed917a7ac1b7691
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging it as a 'payment redirection lure'. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the presence of many external links, including one pointing to 'nipisod.ru', suggests the document is designed to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://nipisod.ru/123?utm_term=how+to+trade+in+amazon+gift+cards+for+cash PDF link annotation
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/moxukifimevop-lijugebi-rokimifavar-gemoramopal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_6015ad84ae895.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/a195e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_600c160850643.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/4bd789b571197a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_600b9b5e24721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5ff90530c7f12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368951/normal_600021ccce96f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476445/normal_5fcbf37c53b22.pdfIn PDF document text
    • https://zutupowetor.weebly.com/uploads/1/3/5/3/135350992/muramaviloxonalin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449968/normal_5fc728a008dde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5fcf1c1d431c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382773/normal_5ffef191c4556.pdfIn PDF document text
    • https://rajiketuwomap.weebly.com/uploads/1/3/5/9/135957261/1976572.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/3cff8.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/bdb60b417d1.pdfIn PDF document text
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/d89f05a081779d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://samanoniminowut.epizy.com/believer_english_song_naa_songs.pdfIn PDF document text
    • http://suvowafavij.epizy.com/18302501329.pdfIn PDF document text
    • http://xavifitumar.rf.gd/how_to_create_a_server_in_tlauncher.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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 5504 bytes
SHA-256: f54510d58cbd7dfbf89e1ac98c4d60e105d091ddba67174c71be4acadbd210d3
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 10516 bytes
SHA-256: b32bcfe1c2c70c7e914cda45d03abb372d8205b75c446b3193f2f8ad17a0ad49

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