Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90803642bbd6ab3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 02:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 572283544324acfadb1f8e279512efe6 SHA-1: d314afbde35061713e12637544a5d8eb05bc4ddb SHA-256: d90803642bbd6ab30f31a1edd1e21309abec99b468f54bbb0b09394a95ac5f80
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_RANDOM_URL_LINK' suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=call+log+monitor+pro+app+download PDF link annotation
    • https://cihangirhotel.com/upload/ckfinder/files/98564662325.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/95532923793.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/57917464730.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/68326509254.pdfIn PDF document text
    • https://bataretak.com/img/files/file/93107134608.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/38733107198.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/kixuwelonesigetuziguji.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c2b22c7ee11bdee19827e41603883156/kidere.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109072333447412.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/zetalijupevomemiwan.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/lenegazulavedojadij.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/87529138708.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/gubuxawaziv.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/96316746948.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/nolugek.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/87660418237.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zovebawogejajasiximunub.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/wafepalosutamamapazimet.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/40543414372.pdfIn PDF document text
    • https://mimpishio.com/contents/files/45510463698.pdfIn PDF document text
    • https://ferropula.hr/files/kafuxopezikosugejunerorub.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/97258980329.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ptubv1b4pculid8gnaq8ijtul7/26121966256.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/56101312105.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/2387105413.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_off0000b0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B1 15628 bytes
SHA-256: 1d5107f5c9398208ba9ed4d2391cd1b24ae9b1a024d940547bc48b68b890a2ff
font_01_sfnt_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 10552 bytes
SHA-256: ad67d174bab1783bfd99af7d6d287dc0368747f548c4f5099cb5cdd681ffb2a0