Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81dc04fe54bd890…

MALICIOUS

PDF

69.3 KB Created: 2021-03-04 17:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6eb0306532bd0a61944b77a03f3dbaee SHA-1: 09302c107887dcbfa118df2adf055ff9b03b1aca SHA-256: e81dc04fe54bd890b4a65ddbcba2b77bb1c1e8534284c19edb53fdcee3fd3775
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links designed to appear as SEO content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/123?utm_term=r+code+tutorial+pdf PDF link annotation
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/a271e1a6d5bc.pdfIn PDF document text
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/geginonilaxira-xedipukule-zijalebutivog-najoranukutex.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/fjhRSha/xapivitogasebunanilaxigen.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/GUHhjCV/smart_manager_android_uninstall.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369311/normal_5fcb2e10897a6.pdfIn PDF document text
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/xiruzolinu.pdfIn PDF document text
    • https://muzifadisuluso.weebly.com/uploads/1/3/5/3/135347683/4753647.pdfIn PDF document text
    • https://lobumemimakagom.weebly.com/uploads/1/3/3/9/133999871/josifimilu.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/1c4ecdabf.pdfIn PDF document text
    • https://wejerimaz.weebly.com/uploads/1/3/4/6/134648800/wepitozobigiluvibale.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/tafimuxijojifivi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464056/normal_5fe4a8b6c5c83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_603b8991392fd.pdfIn PDF document text
    • https://lagukowimewalis.weebly.com/uploads/1/3/5/3/135335318/f14da4b3c1a3b.pdfIn PDF document text
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/kefosavelabifadi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382789/normal_5fca8f8c6d14c.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/3kdthhA/notepad_free_download_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/soundpeats_force_bluetooth_headphones_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/71060883938.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_431d392a1df44424942a206e741a7f11.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_2f25194224a2422e8e305a52cd4670b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/australian_cystic_fibrosis_nutrition_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/consonants_blends_worksheets_for_kindergarten.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_off0000d2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C2 4976 bytes
SHA-256: bb31140f61959bf891dbb73361a7be365896fb72a940b18ae3a6470f080fe803
font_01_sfnt_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 10592 bytes
SHA-256: decdc62426e3ab1ffb1dc67b7663280bd159ef14d0a1ff5f922e9188929b38f3