Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a4da01ae93f822…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 13:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6bd5544bbb5e43fdd05e9405a75ccd9 SHA-1: da6c551919840d0e808324f7e9ffcbab7a525e51 SHA-256: f1a4da01ae93f82212e087d6b7d30a83930b76ba4b23baf8166f60ce263f3e48
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a callback phishing lure, as indicated by the SE_CALLBACK_LURE heuristic. While no executable scripts were extracted, the PDF structure and embedded URLs suggest an attempt to direct the user to malicious content or services. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://elektromig.pl/userfiles/file/rumimabomiwevovalasovid.pdf In PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/8896034787.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/tedolipuz.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/96987058397.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/70805367422.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/motibuvekibozofipamikoxuz.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0dea9cc7167fb35540f715ed0464fc4a/muromewutudipulesesujax.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/32729499395.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/34014934611.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/xexona.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/zugakusitotapa.pdfIn PDF document text
    • http://koala-al.com/d/files/dadabatokararifagebawiw.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/76202614602.pdfIn PDF document text
    • http://ktcz.eu/files/files/litujar.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/92994544175.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/fojuxuzarofozatom.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/94532191141.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/81221728663.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/70612942766.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/wuzuzutagekinela.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/buvapavofepiw.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/23628294838.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/58794623398.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/48495957757.pdfIn PDF document text
    • http://imbirimbir.ru/files/49222121743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+find+router+password+on+androidPDF 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_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 18908 bytes
SHA-256: f97c9a0e5abbdb873abe963805656b8e14960b31daada37a154c5ec91d4f02c8
font_02_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 10624 bytes
SHA-256: 9603f87e92b29d23beb7b4e65a2076d6ef44425e470b6b69bdc4d8f3c06c93e2