Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b36d31ec71695b8…

MALICIOUS

PDF

76.9 KB Created: 2021-06-08 06:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: af1693df73796e96c5e194b04517792f SHA-1: b5fd3c69f90f8ad177427dae76edd8b31edd86d2 SHA-256: 2b36d31ec71695b89d6b0439e11d23568461eb645a98112a88abb4e12fc3f554
186 Risk Score

Malware Insights

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

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 0.9991

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.
  • 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
  • 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=mx+media+player+android PDF link annotation
    • https://luxelekite.weebly.com/uploads/1/3/4/6/134656707/4399703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_6068526466646.pdfIn PDF document text
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/lalazisik.pdfIn PDF document text
    • https://gileledera.weebly.com/uploads/1/3/0/8/130874536/nobasireg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460968/normal_6004142aad8e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_6056f885f04cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_6011dc27ca59b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_602fe1b0d088d.pdfIn PDF document text
    • https://zofijakifixanow.weebly.com/uploads/1/3/4/6/134677560/zewodilulux.pdfIn PDF document text
    • https://nuwudune.weebly.com/uploads/1/3/4/3/134362296/gakofa-jirik.pdfIn PDF document text
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/5788328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451217/normal_5ffc39108a294.pdfIn PDF document text
    • https://somuwozav.weebly.com/uploads/1/3/4/5/134525430/957a07bf1.pdfIn PDF document text
    • https://zibamikalizofu.weebly.com/uploads/1/3/1/4/131409526/rewarotib-mumarit-sidozagiveted.pdfIn PDF document text
    • https://mabexerezigija.weebly.com/uploads/1/3/5/3/135324341/476286.pdfIn PDF document text
    • https://vigenawora.weebly.com/uploads/1/3/4/4/134495248/kujosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_5fdc08e4b460d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144534966/funisimik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6232d4f-1556-421e-83dc-653bd4556078/how_can_i_get_my_w2_from_walmart_if_i_no_longer_work_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11637d05-c1ae-44c0-a81c-3287e4e8308e/42296292847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a33ea81-54f2-4901-88c2-99a807909cc9/where_can_i_get_a_pedicure_on_sunday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b3f369-2dcf-4295-9ef1-7637747d22e5/bose_qc15_ear_pads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7967991b-2e46-4453-9be9-1d67d49235a3/41109960762.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144491922/54101713987.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_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 5104 bytes
SHA-256: 7a0cf5b931c44631a41220c84a3a5ed3e2f8698e545d469620b6188eabbf19aa
font_01_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 10956 bytes
SHA-256: e83741ffc5a19a9776da43e00d9a854ec3c6db83695682a043c709b85f27e3f9