Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ed66139de2c930…

MALICIOUS

PDF

112.7 KB Created: 2020-12-31 15:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a45f7d95e720361e6af22b1e7d0d9b75 SHA-1: eca6d4179fb715a0f2b49cb33218486dfc395b99 SHA-256: b9ed66139de2c930a75ad28843733968b3592dea67492f136fc4d557c3a599ab
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The presence of numerous external links, many on disposable hosting, is a key indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafftec.ru/strik?utm_term=galaxy+striker+muse+dash PDF link annotation
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/ddec02b.pdfIn PDF document text
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/jujijenu-kivana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462976/normal_5fce899420c5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5f9d72bb800a5.pdfIn PDF document text
    • https://pebawatiwokup.weebly.com/uploads/1/3/4/5/134576243/f1df613a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_5fad924e6c0cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_5fe8161fef8eb.pdfIn PDF document text
    • https://mifopezuzata.weebly.com/uploads/1/3/4/4/134484464/aae4dae68.pdfIn PDF document text
    • https://lisajakuxateril.weebly.com/uploads/1/3/4/3/134349263/zunavukidibugo_raxiru_goguwemewule_budugen.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/luterefuxa_jexijepove_mugifuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fe0f1628cf25.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/iMijbgi/roku_account_suspended.pdfIn PDF document text
    • https://zifimegepero.weebly.com/uploads/1/3/4/6/134601706/ff9a4140c63a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5291ebf9-c2eb-4243-b6b0-a02052459a7a/rekilejakagiturozelege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b71f090-89a0-43d3-b2f3-fdad2977f0de/the_frustrated_songwriter_s_handbook.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 31332 bytes
SHA-256: 4c553c16e480da29855c6fa62403abdc237f282819f01b33d2f28ce2fbecba4c
font_01_sfnt_off00015fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD4 5332 bytes
SHA-256: aa743572a6f8df89c66f7fa4d09300264c0400cb28cfd12e451465d7d4dde16e
font_02_sfnt_off000171d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171D4 13748 bytes
SHA-256: 8f04f64771627494ac4e4f8e42ca2aa5cb507d9b241612da948ced594ccb270d
font_03_sfnt_off00019fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FD8 16132 bytes
SHA-256: 895f66822cee8096b629ba52ebdbe333aa959cf625638ac8af8884b25f69792f