Malicious PDF — malware analysis report

Static analysis result for SHA-256 85889330394271f3…

MALICIOUS

PDF

68.4 KB Created: 2021-10-04 07:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab64fec7511e377481a5ea27e958194a SHA-1: 697342f4d7b38d581bf27682468e380126a7b605 SHA-256: 85889330394271f30eb38964ebedd03d21fd647af6efff4f01e770de735046dc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Bypass

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with high confidence. Heuristics indicate it contains a link farm and attempts to bypass security software, suggesting a phishing or malware delivery scheme. The presence of numerous suspicious URLs, including one pointing to a raw IP address, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bachson.net/upload/file/danubikewopujizuloxapiw.pdf In PDF document text
    • https://dongciao.com/uploads/files/202109270951317135.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/gatepiniduro.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/tilizitezikebi.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/74434598427.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/90445768235.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/96857373225.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16157070ead76a---32478385712.pdfIn PDF document text
    • http://szpk.hu/_user/file/vuwetexojexarov.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c86f2f6a7---13986805582.pdfPDF link annotation
    • http://ncteonline.com/userfiles/file/3421352004.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/13638413235.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7c0dde213248ef90f3da1070a1606823/25127721503.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/59615097450.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/fapudolimazebogaz.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/71515005181.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/kumilavumuxonabeke.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/vajukarataruzerafifa.pdfIn PDF document text
    • https://cncunse.com/d/files/japetusunejavewobodez.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/97691564892.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/bewariwadisurijomulifusa.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/77212204817.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/dekiwunogabobemeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+do+u+say+who+are+you+in+spanishPDF 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_off0000ae98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE98 14804 bytes
SHA-256: 859e659d5a89e5f4c96fa27deaec6b9a815f9e592ad19394eebe3e07ff5b4293
font_01_sfnt_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 10636 bytes
SHA-256: 85041316531305f2a38fc57f38e84cd46e766cae88e60137627a3fe8ff50f107
font_02_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1