Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df5b2593d397860…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 21:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8961816ad218e0dea233171fa707f528 SHA-1: fb8021632819d03c4e85f7cfa63fe49dd6f0f977 SHA-256: 1df5b2593d397860fc759e12d822cf1a1f8475995c094608dab30db2ca038454
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://thesecurityguardunion.ca/userfiles/files/wasamizamewefexe.pdf In PDF document text
    • https://mattress-leader.com/media/pugijiwefifidikirogaboza.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/41889584149.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/34370892722.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/lowot.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367d3776409---zivinitijisal.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/94737707531.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/wutetegudipemexize.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/rowakusorawe.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-12/20210912201846552842.pdfIn PDF document text
    • http://nscenter.cn/upload/files/73816686265.pdfIn PDF document text
    • http://sparkpro.lv/content/file/56524691391.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/ximebusomusimijuna.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/liwawarejatawu.pdfIn PDF document text
    • http://storemisr.com/uploads/files/boraweravuganil.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/nawidoxibaxew.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/34483258982.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/12499976319.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wifemubofemudubudutux.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/mufutosevinafesebab.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614377837fdc1---64717608801.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/1636891661.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/65378130100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=molecular+biology+book+pdfPDF 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_off0000ba3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3A 16232 bytes
SHA-256: 076fd4cbed619699cb71c5155f0b3eab637a284218b4be68a2bd2c676f86e097
font_01_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 10864 bytes
SHA-256: c3e8c40a43e919b8203fc1e74ad3c398e13f2c733b54804989b424e2d95c2a9c

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