Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad53f4d60f500c56…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 17:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 87f49b9e7fff4eeb7ac3dbea8a96592f SHA-1: e5473194acf23db2c2c4e3e3c4f8da393fbe934e SHA-256: ad53f4d60f500c567254d5b2d5640d15502d5e2f12bd1289c995f1f01f4987e1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, indicating a link farm or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest this is an attempt to distribute malicious content or phish users. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://rzn-house.ru/upload/file/gexeb.pdf In PDF document text
    • http://cec-intl.ru/app/webroot/files/file/reromoteviwitonuburekuki.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/32164810663.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/duwusukugefojuvomibu.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/13088198549.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/94688271870.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/58845301511.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/kewusanurunelejes.pdfIn PDF document text
    • http://potya.com/66181561506.pdfIn PDF document text
    • https://akemi.ro/hirek/file/60445413635.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/xapejurejodibanulelonam.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/70064630705.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109040912268314.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zawidegikiniparixezobew.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/11611870674.pdfIn PDF document text
    • http://thedreams.cz/files/kelagijeronowowoguraxa.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///jetagivabekipif.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/setilafeparunizil.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/jeporatiwemigusineruxigav.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/12939013301.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/35867720710.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/10429169046.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/74351252999.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/vubagapogopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+voice+recorder+pro+apkPDF link annotation
    • 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_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 10488 bytes
SHA-256: ebc65673a4706a66afd4cd1073eccc9e5518c2bacc0b35c5d39647f1f819ddc7
font_01_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 18692 bytes
SHA-256: 146c3f21c2ef6f25e7965e6871d28fca01d927b7029ab9e2514d7c1badbf7128
font_02_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1