Malicious PDF — malware analysis report

Static analysis result for SHA-256 5feb4bb314e234cb…

MALICIOUS

PDF

99.5 KB Created: 2021-09-13 02:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bb82b275a82902eb85ff7ddde43c398 SHA-1: 3330a376670f9fc4c9e53b44d418a4aad265fea2 SHA-256: 5feb4bb314e234cbefab927b06f2e5ba3cdc643edf627cd3ef24f85ad37ec291
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or scam campaign. The presence of a 'callback lure' heuristic and ClamAV detection further supports a malicious classification. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect the user to malicious content, likely for downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=instalar+google+play+para+android+gratis PDF link annotation
    • http://artc-polymers.com/upload/images/files/bomexujevorin.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/butamuraneninalibamofusom.pdfIn PDF document text
    • https://andana.us/files/files/kukukemedipaguvifumovar.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/bugefakanozadadibopezepoj.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/kovimirebirebametobuta.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/sawezadipapufelijate.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8730b2cdb---xujavipozetuvukenude.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210901_1355A3F3E6ABFEB7.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/jegusisej.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210910_fe35d.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/99576022987.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/forekixebab.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/lomumuge.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/58351888198.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/86927090562.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/fugelowivunugazerajiwusa.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/6468083292.pdfIn PDF document text
    • http://davobio.com/upload/files/pojogumizibeziwul.pdfIn PDF document text
    • https://photofetimages.com/61433496808.pdfIn PDF document text
    • http://rc-modeller.se/images/file///renuk.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/9807622082.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_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 18392 bytes
SHA-256: e4e70fdef6e5929a92ab70ad6272895869197091af01de1ef12a417494740de4
font_02_sfnt_off00016808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16808 10632 bytes
SHA-256: 650e7a816d9d4db5360f69927777a096106603698f3c17a39752bf737ebbb29b