Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7b918a11430cec…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 14:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3ed3fb2d08d364f7d2a8e95a935f3a9 SHA-1: d2dd0efcc662e306ebd2bc6fa6198c0d5db9c52c SHA-256: 6e7b918a11430cec54f82d79ca13910cf1b6b26d987009dc320c29d156e3f9ab
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, several of which are flagged as part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a common pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=my+hero+academia+season+3+tagalog PDF link annotation
    • http://speckrepeg.by/UserFiles/files/67113494560.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/78329760290.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/98222624343.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/61410984948.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/zenujenowasilen.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/betelukubolaxed.pdfIn PDF document text
    • http://precisao.net/files/files/46138694186.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/faresi.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dpvmn1j7tsj70odn3u355vjgk5/tozuw.pdfIn PDF document text
    • https://ocw.tw/uploads/files/83789867410.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/10123181874.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/25451588384.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/luzetojev.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/teruwu.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091115270373499.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/gunopukenizizowe.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/daremepipenijolufila.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/30462431977.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/rifakejikojomadoxabifodow.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/67076811099.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/6601091628.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7e6df0a7---sujilovujidoxosolokuw.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_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 21048 bytes
SHA-256: b4149b6a1799be5ef94c704262cd04af344e510faaa67224e023b129e400568b
font_01_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 11096 bytes
SHA-256: cd01585852b9318f6597c3528dc28b7b6c578b7d5b3dc8f477e461a758eecf3f
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1