Malicious PDF — malware analysis report

Static analysis result for SHA-256 a409394dba9d8269…

MALICIOUS

PDF

74.9 KB Created: 2021-04-05 02:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c99f65920d5a2197bdc6403b981e7b9d SHA-1: 52de0db8a5a99dca6771788122012056db4cda1c SHA-256: a409394dba9d8269a9196f3dfadcd42580a5aea0b03aa8ed6fdeaef9960d5ac3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.8299

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 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
  • 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://xajibur.ru/award?keyword=computer+science+engineering+pdf+books+free+download PDF link annotation
    • http://deemonatrafik.xyz/buzerixijevunixemefawilqnkc.pdfIn PDF document text
    • http://best-ital.fun/mijexitewomedilt3zt5.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/7847825.pdfIn PDF document text
    • https://maxafusisiwesu.weebly.com/uploads/1/3/4/6/134688878/6534603.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/hiiifjb/88615800701.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/tazeniwimu.pdfIn PDF document text
    • http://sovolox.getenjoyment.net/roxavevo.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/sewibot.pdfIn PDF document text
    • https://cdn.sqhk.co/bokupajokim/jaY2Jgf/20041941141.pdfIn PDF document text
    • https://garowowo.weebly.com/uploads/1/3/6/0/136033653/wuketab.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/81062063-7d9c-42bc-ab6a-5c31d45defbb/greek_mythology_echo_and_narcissus_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/011867a0-7365-4797-81d9-0df14654d79e/mibivinisagulutazad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11cf689d-6739-4352-bfd3-b6daa9aa3e99/dunkin_donuts_beyond_sausage_sandwich_nutrition_facts.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_3c0d02a8a6b146ca8835b6e50ae78d88.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_a494fdd1a70d4ac28e7d4dfa48bee76d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d495f722-60a6-4e52-ad6c-02e6de0d09dc/xemuzilizono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888e651d-f7c5-4e51-8796-e164d231a105/70640111916.pdfIn 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_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 4156 bytes
SHA-256: 1f03a9f1dbeb9699da95863febb4a7d67a1e8fb499db66f3d0402a6cd18919b2
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 5676 bytes
SHA-256: c85e0bba2161563d4ad3358911f3d88e393df9b2ff37acf2e51f469d980b9e20

Open this report in the interactive analyzer, or submit your own file for analysis.