Malicious PDF — malware analysis report

Static analysis result for SHA-256 017dcd0bfae8f803…

MALICIOUS

PDF

86.5 KB Created: 2021-03-30 18:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3f10d633eeba8c16ffe2f7765bb2b4fe SHA-1: 68056a77c936866ec849bef5e8e61c0f6540f0e1 SHA-256: 017dcd0bfae8f80398aeb3fb408b883ba29b250db4f67bb1e25fc1b40a687a5f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious links disguised as legitimate content. The primary malicious URL identified is https://bologen.ru/award, likely serving a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://bologen.ru/award?keyword=fybsc+physics+textbook+pdf+pune+university PDF link annotation
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/8805870.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/wewavuxitujum-wedijuxevo-soregiv.pdfIn PDF document text
    • http://sogixusi.medianewsonline.com/9601223836.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/systematic_literature_review_filetype.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/kofeguromalegoko.pdfIn PDF document text
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/getegepevolubanajuke.pdfIn PDF document text
    • http://taxokisekajetek.22web.org/waruvo.pdfIn PDF document text
    • http://daravto18.ru/620402639516p2fl.pdfIn PDF document text
    • https://lekevemu.weebly.com/uploads/1/3/0/7/130776436/0eec4.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/wrist_blood_pressure_cuff_reviews.pdfIn PDF document text
    • https://tapukinag.weebly.com/uploads/1/3/1/6/131606864/a8b1592d5c9.pdfIn PDF document text
    • http://save50it.pro/halloween_printable_halloween_hidden_picturesq22wo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4b3753d3-c873-48c3-8021-065f970f8232/zegujivoxudesudoroj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08fceffb-27ed-40ac-a8f3-44da10797df7/ninonadegusarewenabil.pdfIn PDF document text
    • http://mugukogegib.epizy.com/movie_booking_site_template.pdfIn PDF document text
    • http://gubadif.myartsonline.com/79327833553.pdfIn PDF document text
    • http://jojasodux.epizy.com/miduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec00f22-4974-49d2-b778-65670c4fc2ef/vonelipesavupevipasip.pdfIn PDF document text
    • http://tebokemirutexus.rf.gd/1707842235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d02383-24dc-4a85-aef2-a1bb2355dedb/74985310702.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 5272 bytes
SHA-256: 6bfc90ee7a612c572f5834a12ccccdf6f69a754cbe81ae6ee5dc0caa4156aef0
font_01_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 3204 bytes
SHA-256: 55635b50bad29c6b04cd9b4d5dd064b78be6c29eafc981c666da6fe4470a6799
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 10860 bytes
SHA-256: 7dcc9688a3803a618ee13acccb15dbc53ee8f0b3aeabe3541eaa42ddb83d3e93
font_03_sfnt_off00013ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DED 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333