Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ab14334b3cf036…

MALICIOUS

PDF

87.3 KB Created: 2021-09-23 03:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a25730405943306103c09a1ebf448d1 SHA-1: 7a1b617a2d4e3043e0989175b2564489f83245ab SHA-256: f3ab14334b3cf0364b43c2f69d346c4d539575b49f7e46a69ed59db1c2538d2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of embedded URLs suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://irlanc.ru/uplcv?utm_term=root+android+6.1 PDF link annotation
    • http://eprdel.cz/userfiles/file/sogojuleposawaf.pdfIn PDF document text
    • http://surausa.com/uploads/files/2154521016.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/darafiritikaliwogubif.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/sejusokenadej.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219172133147150.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/werubavawibokituzekazileg.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/50626136199.pdfIn PDF document text
    • http://ipceurope.com/assets/file/87621392517.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/52305714610.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/99480550623.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/42890841853.pdfIn PDF document text
    • http://kientam.info/uploads/userfiles/file/domisonokevudolasibum.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zozufikeruxerez.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/20548647209.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/62778561298.pdfIn PDF document text
    • http://epicridesnepal.com/files/87687012493.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/94842519254.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///xefezaxeronodepigexo.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/zorojusavisep.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/38430033776.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-19/20210919152044974986.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/walewa.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/nalewanejer.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/venegosumalotexi.pdfIn PDF document text
    • https://mcsfood.com/images/file/zanijaxelu.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_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 18596 bytes
SHA-256: 6fbd4abe6af400533d93746ea31cde18c742611dba801d9c615ad96f79ce8878
font_02_sfnt_off000138c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C5 10224 bytes
SHA-256: 650c472d97db857706640768a9c1571b87832a399af71ecacac4feaf8f51caa7

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