Malicious PDF — malware analysis report

Static analysis result for SHA-256 040c458172d1ea7a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-15 14:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c0e2ea16abfce7e5ae0e1645697a8d6b SHA-1: 1f8bcfba812f56de1368c4caa5639bf836f58afb SHA-256: 040c458172d1ea7a07c440f28fee1983d9b17a4792261e2e99b1f7a72d9dc45b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to external domains, many of which are hosted on potentially disposable infrastructure. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/11bbf7acf497901984b8846bee9345eb/88317192660.pdf In PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/taribunuwonapadawib.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/54440258553.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/11896533507.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/8699917174.pdfIn PDF document text
    • http://enewind.com/pliki/file/jugikaxiziligenetarus.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/gasazozekokisabadoravokit.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/dexiwutefarojol.pdfIn PDF document text
    • http://freewest.at/45240543385.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/1995797365.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/badexesovun.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/1541945051.pdfIn PDF document text
    • https://5udua.com/contents/files/telego.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/navisofa.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090306250473499.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/kikefuvokabutuvelosi.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/78060074667.pdfIn PDF document text
    • https://dhesient.com/media/gamupuzafoluvazefopiva.pdfIn PDF document text
    • http://brukbet.com/user_images/file/kerenofukotetidamusun.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/7347848235.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/suweduxififibuda.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/falunujeji.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/fixef.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/doxerofowinijejo.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/gorebukaxogogizulologo.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/16882544330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=stickman+pvp+wars+online+mod+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_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 10992 bytes
SHA-256: b9f861dda7ef5ee3df63dafe78ecdef0806e0c2389792b2e27818b7c27c1d0ab
font_02_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 19196 bytes
SHA-256: a92c03174ae27a3b896d92937afc7a2181587b59dda855fa424c650bbfc01583