Malicious PDF — malware analysis report

Static analysis result for SHA-256 e172645ca8ac7c77…

MALICIOUS

PDF

73.5 KB Created: 2021-10-03 15:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0650505f0f72191dd284e112c0d28a42 SHA-1: 20979884d29dcf845f46745b044b389c48c9634b SHA-256: e172645ca8ac7c77c7a2fecb56d01a9935fbdace0dd93faa93069d868c6301ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external URLs, many of which appear to be part of link farms or disposable hosting, further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=multiplication+without+regrouping PDF link annotation
    • http://kxzyjy.com/CKEdit/upload/files/difatorufojonotil.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/17178987053.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/sinusofonugumokal.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/galepelofubimesakara.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16158b317b02d5---xevodetotuwalofabug.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109301911478513.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/pazorotabetap.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/piwopurunozutuxefix.pdfIn PDF document text
    • http://hakemokulkiyafetleri.com/upload/ckfinder/files/kafonewirirezekira.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/vogibugevabitapatoz.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613963d54adb1---sudijazuramonimupevolipe.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1381076757.pdfIn PDF document text
    • https://rubfila.in/files/file/54948143065.pdfIn PDF document text
    • https://value.ae/userfiles/file/15538610124.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/90469211602.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/72086157457.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/serikuburamalaf.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/45121618919.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210919/file/16320044468060.pdfIn PDF document text
    • http://bluebossa.pl/files/file/jonawob.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/gavugigisaparesavolep.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/54468803663.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/bexemitimunovigumarilox.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/vodamutawekok.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_off0000b875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB875 18572 bytes
SHA-256: 1b4d7d684243dfed9a842dffde3a4bd4812b8c950d75aef25fb2927a0139813e
font_01_sfnt_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 10664 bytes
SHA-256: c6009e360d400a07407e403e101f6809f5c701a484e32537267c8b8ac6f02ba9