Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ac7af95083909b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-09 11:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d376c21d0f133dace132b158ebbf7ce SHA-1: 4b5ad785c2b2855f8bff4b52ec72a322eb5819b9 SHA-256: f7ac7af95083909bf43201bb9d9f226545c673182a0e93ebdbcddf82a711efbe
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics suggest it functions as a callback phishing lure, prompting users to contact a number for fraudulent purposes. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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.
  • 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://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/93984970810.pdf In PDF document text
    • https://goldmenu.com/userfiles/file/nupujon.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/38755278437.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/zunapunedivegutivuwudu.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/takirafivoxuxiwerifimegu.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/90192116142.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/mazogexijuxivilo.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109011948434240.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/doxabumitotut.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090319333175.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/86713260263.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/46807751831.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a409bf19---7820636231.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/vukixadarajibumilagujax.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/jerejuf.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/62892378727.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/nikameselivafesivezoruned.pdfIn PDF document text
    • http://xhzhengli.com/upload/14018406283.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/tizamewetubur.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/kedosifubejuxewelivutewoz.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/66173015777.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6a7771d1c55d01d2f08f03e6e85469a2/41059419002.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sozajejobisaworinepa.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/bibatazanugokinor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+go+get+coinsPDF 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_off0000b2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A9 14188 bytes
SHA-256: cdde2d793b919b985314558e574900f6a49e263a4ee6e4ff5f842feb9e85728b
font_01_sfnt_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 10356 bytes
SHA-256: 575e6fde2b5fed95132fdf5c536548b4ceab5a9621c02e5422ad3d76668beb76
font_02_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1