Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e07e58a9450206…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 20:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b184ce80f509c5a68c943351cea5395e SHA-1: b55a5b01c31b07b3f7c7934dc534d77a18ec148c SHA-256: c1e07e58a945020634b91e4fafd547bbb1beb268a843a266358ac888d6add901
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files on distinct domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://happyhanool.com/ckupload/files/peruxofudox.pdf In PDF document text
    • http://ciccioinpentola.com/userfiles/files/kedasisinazopugi.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/lufajakojuxozatalemifi.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/98980561673.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/74215720052.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimovasok.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/govanabuwuduluz.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/gakisezosaxedikigunak.pdfIn PDF document text
    • http://bulmarconsult.com/files/bobeweza.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/molebatubazo.pdfIn PDF document text
    • https://partnermind.cz/images/files/lezovifukozotexanupetev.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/razasazelidovudu.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/lilizufezesapunubesine.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139701502a06---kokojususapubiletivabodi.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/7004121196.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-11/20210911184940321419.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/18004168370.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/31573603873.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/zebugijivojatomadawire.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/pitorewid.pdfIn PDF document text
    • http://arsvet.ru/img/upload/giwesulibofaleleseju.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/66936883819.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/87018931564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+take+deleted+videos+from+phonePDF 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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 11000 bytes
SHA-256: cffa068727424ed8edb0fab20994f2d8b7c75f9839f5f5dc747e25ecbd8d638a
font_01_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 17952 bytes
SHA-256: d0338912cdf41c735890a0c0930565a40768b4a0e9f05d0508f96ff2d1435b19
font_02_sfnt_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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