Malicious PDF — malware analysis report

Static analysis result for SHA-256 e554e966437c5c56…

MALICIOUS

PDF

72.4 KB Created: 2021-10-03 18:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 419cb369ba38b6c03b91530a8a80032a SHA-1: e89bddb6cc4c9f97f1956e7e6c14573957b5c427 SHA-256: e554e966437c5c5610aa8d0979d1ae116aa795b8a9a806de630e2c9a76514c1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of spearphishing attachments designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://archism.ru/uplcv?utm_term=brenda+strong+topless PDF link annotation
    • http://malovanesklomh.cz/images/file/40147190984.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/64489014144.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210927063530.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/26295822065.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/76379851575.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/55897765126.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/54159752291.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/44440341999.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/dakoriliwazoviboz.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/75206836921.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092819482273499.pdfIn PDF document text
    • http://venkateshservices.com/uploads/68198049917.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbb3c48515---guzozibobak.pdfIn PDF document text
    • http://usagimatur.com/files/others/25790408108.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/45746619253.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/31609894634.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3f8da1b6a---31224062821.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/wenununuwomu.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/37224898383.pdfIn PDF document text
    • http://sissonne.hu/editor_up/lipar.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/meguj.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109021722452659.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/67356632231.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/mepadujadaratikasexos.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/91538439464.pdfIn PDF document text
    • 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_off0000b48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48A 10528 bytes
SHA-256: b10a269827dd7a54eba112615f82a7287dbabe34361ba41cc49183ef33946705
font_01_sfnt_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 17744 bytes
SHA-256: 84c2c1ebb6b817cbcabe5d5d40168c92a88136484b708f7b7701f575e6d4c9fe