Malicious PDF — malware analysis report

Static analysis result for SHA-256 570f2401a21f2443…

MALICIOUS

PDF

91.7 KB Created: 2021-10-06 15:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9fe9b5f70ecce58a3658f234cde74ab7 SHA-1: 9fdc54d2cfd01f2fe7ce77d6d17b7eb6b975a630 SHA-256: 570f2401a21f24432ab629915d8676fd5d74371d87991f15302a60e8755c3ac6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a pattern of using disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=how+to+set+the+time+on+a+marathon+wr50m+watch PDF link annotation
    • https://mjrspot.com/fckimages/file/famebazoletisi.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/goxotesazurej.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/66640676520.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/vadokavodezavabit.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/81254418031.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/45146444927.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4b613c569---48805490491.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/18638516072.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/89060385813.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/9640308435.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/1127343237.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/logokavafelewajulemulev.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/78653493167.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/93103781500.pdfIn PDF document text
    • http://palami.by/images/file/gikuminirono.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/relobopuxoximeponuzarilak.pdfIn PDF document text
    • http://tfforming.ru/d/files/losuwixafilunodovegofepu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wakigekebavukalumevu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153bebed184e---82676477869.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/36899992242.pdfIn PDF document text
    • http://strandedtattoo.com/file/80298812309.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/besajeviwaziwovoxuduzi.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/robuvapigudosevoxuvutof.pdfIn PDF document text
    • http://awards.nl/img/cms/file/46151961802.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/7348637398.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 10780 bytes
SHA-256: b99e9a71c9d7ea104606c969ae5636038cd33b41e2c2f2e6f560b9620242ae95
font_01_sfnt_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 19320 bytes
SHA-256: 52b168b6bb5bc1be582fa5df9735d4ea101518992a84d6b4b4091aa618836f59