Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdf65fc0907c5e8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 02:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0adc9e3226013ec2886c09b7d2cb937 SHA-1: a0ff7544da258992bcac804efad0eeeea4cee94a SHA-256: 3bdf65fc0907c5e816ea7d6973ccdf86f9f197d4bf23b158e4e5b86a4e84cbb9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm heuristic firing, suggesting it's designed to redirect users to potentially malicious websites. The embedded JavaScript is likely used to facilitate these redirects or further exploit the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=how+to+save+pictures+from+viber+on+android PDF link annotation
    • http://www.veslovani-vsb.cz/soubory/file/bonabevaduvuzu.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/pozug.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/95805479198.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/50548303317.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/12468065378.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/sikajikagozupovawu.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/pegebejuriju.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/37387337333.pdfIn PDF document text
    • https://chp-travel.ir/data/file/valeselubugiwofo.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/7286997552.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/7191050925.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/def344114fa612ea048fee390ee86797/nokuzowe.pdfIn PDF document text
    • https://eniedu.com/data/file/20210903065317.pdfIn PDF document text
    • https://subded.org/userfiles/file/zasidujavumugu.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/xaraxubelenona.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ce2e87a46d866fc07c9bba7c3cc506b7/33777383884.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/dexuko.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/35527742256.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/34638839518.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/56057041673.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/33845808261.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/sirunaleferojofovalu.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/luwusivegi.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/zoroxupe.pdfIn PDF document text
    • https://vleek.com/uploads/files/29875064197.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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 17892 bytes
SHA-256: 9fe675f6addddb50184d6f80ef1c4c707873849cbc5f4f6d714e841d2c6be8dc
font_01_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 11120 bytes
SHA-256: 5e6e40d6339453ee0831b8fac924d7a3bed928bc66317a1798566918c168d4f9

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