Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d31e4a935eb352…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 18:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c60068eed532a42f9aafd00a93e4640d SHA-1: 4e9c3e21a166f5b9d11126c8276b3a3a3d9d7234 SHA-256: 37d31e4a935eb3528a6610683ef357e49f2f6ed59fb9a3b0b74c17c2e63b5b2c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics, including ML classification and ClamAV detection, indicating it is a phishing or scam document. The presence of numerous external links, many pointing to disposable hosting and using UTM parameters, strongly suggests a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or tech-support scam context, aiming to trick users into interacting with malicious links or potentially calling fraudulent numbers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://coretry.ru/uplcv?utm_term=snowflake+haese+mathematics PDF link annotation
    • https://estatecambodia.com/htdocs/cljr/data/files/54385567964.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/63952939135.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/xibiguzuxi.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/wutitasaxifopabulitoruwef.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/94678032676.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/wozusira.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/kanegitil.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/lugivefipadukuwegote.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/37411399532.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/fevabovekukep.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/23858100955.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/xatilivobonibiv.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/jalosu.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/fopav.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/gimapuzupedefilef.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/32417662266.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/75931315896.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f83a755e35---31672514961.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55408999886.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ropoli.pdfIn PDF document text
    • http://zxsolar.com/d/files/57803097855.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/62279143044.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/b830ac2d93dc00c6bb3d97f5fa878065.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/lavalu.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210911013648.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/molipoko.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/wisosulepakudevaleg.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_off0000c575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 10752 bytes
SHA-256: d722976d846b88b50b64c4077664fb8f047d6bc8a3bd2de774684102317d6ea7
font_02_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 17024 bytes
SHA-256: 208974a241b24d3a805d43fc12e2df3b68f4ac054517651d6ac8bbfb9d5223c0