Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b5a0ba5ee0ba90…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 05:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b24a0ae8b216ebe94d5b4cce1264dc4 SHA-1: 97dc424ca4fecb235eb3c9c6f534d9fc83bd1a33 SHA-256: a2b5a0ba5ee0ba9031dd5b1301a57818d592e003036f84acdf6f28b0d84febcc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery information from the user. While no scripts were explicitly extracted, the presence of numerous external URLs, many of which are on disposable domains, suggests a phishing or credential harvesting attempt. The file's structure and the nature of the detected lure point towards a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://myoffice2561.sesao33.net/UserFiles/File/82925251141.pdf In PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138195078b63---tazakejoxoxasiviwuse.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/25943546971.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/kozuvulesodagom.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/keberigizixajurofejumufal.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/12528093471.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/99786937253.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/34947446484.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/fabimusizivikupubagolide.pdfIn PDF document text
    • http://balone.net/_upload/file///23067132018.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/39460032065.pdfIn PDF document text
    • https://o-dance.com/upload/files/birovabim.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/powazoridetegem.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/37749266664.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/77407655601.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/14009833146.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/2015189898.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/88712421086.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/11664188781.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/59003632342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+websocket+okhttpPDF 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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10700 bytes
SHA-256: b42f5ed9df0a4575a1334c87b28c2e0a0209625a840ebc49572e485589eeb364
font_02_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 19828 bytes
SHA-256: 6e045d5bdb792d17f0a0223ce9e6716a40d603ba42827af3c83d0d30076e3fb6

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