Malicious PDF — malware analysis report

Static analysis result for SHA-256 257d7cec7bce75f5…

MALICIOUS

PDF

88.8 KB Created: 2021-05-30 18:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: daf1b24c327e5ed8114643d7c8010a9d SHA-1: 18136941cd31ec599be42395a92192a8017f16ac SHA-256: 257d7cec7bce75f5029d415ca34ec4cb3cd2320b4c1e5c1c35f148c2c81f0416
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9993

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://vilenefex.ru/strik?utm_term=what+is+the+purpose+of+argumentative+essay+brainly PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482882/normal_6064c5471acdb.pdfIn PDF document text
    • https://bokojisegozesu.weebly.com/uploads/1/3/4/4/134479890/pipudaninoweno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483336/normal_60483c1eb69f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491725/normal_606640cfea499.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/47c5cfff2591f.pdfIn PDF document text
    • https://bugadubotureje.weebly.com/uploads/1/3/4/4/134468403/53d20db.pdfIn PDF document text
    • https://towotadop.weebly.com/uploads/1/3/2/6/132682697/butonagot.pdfIn PDF document text
    • https://peguwuxawotenu.weebly.com/uploads/1/3/4/5/134582441/vuxodoboxafomaw.pdfIn PDF document text
    • https://xotinibawilufo.weebly.com/uploads/1/3/1/4/131437660/9eb98e062.pdfIn PDF document text
    • https://vokafevevuw.weebly.com/uploads/1/3/4/3/134320681/1543a85e028a.pdfIn PDF document text
    • https://tevomijirurefo.weebly.com/uploads/1/3/4/8/134846864/b32d70fca2cef.pdfIn PDF document text
    • https://lodunuvivilaz.weebly.com/uploads/1/3/0/7/130775731/roxanive-sikixi-wiravadidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_6065e04a82c62.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/bebejewogeme-wabefav-nuribuzo-dogekokot.pdfIn PDF document text
    • https://wonidajubiput.weebly.com/uploads/1/3/4/0/134017859/4860571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fd63791cf345.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/a3b15a8c-a26b-45e1-82c8-6188c9578c0d/39874483523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfce1d8-7046-472a-9205-68e3c71c5f4e/mamazenaxozatow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1641dd-2421-4ea6-b6e4-42042a0aea15/82099173457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95606626-0eee-4cf3-b93b-4c18c12e0b4b/kefogejifoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c642fec9-f12c-4d65-9d2b-beae77cc622f/ditepobanarap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ba1518-d179-4ef6-b124-a12bd800b1b7/deepak_chopra_21_day_abundance_meditation_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bf09d5-0b21-48a9-9bbb-29e1d80c7f08/business_math_exercises_grade_3.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_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 5632 bytes
SHA-256: 0159efc053e6e1f03a657360586349a9487d0707ecdc5def594f94d40f3d5546
font_01_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 10720 bytes
SHA-256: 6c2f9c9a8548915e29e79a3a19d8c1c03be247fb776d58f42a508f1b8986bd89