Malicious PDF — malware analysis report

Static analysis result for SHA-256 0983b7d4491fbf71…

MALICIOUS

PDF

86.1 KB Created: 2021-09-08 20:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 90289daaab40d7fe8c78d64dc5eacbbc SHA-1: 57fa2bbd3c93b57ae2ffacf44d79ff7d96fb87fd SHA-256: 0983b7d4491fbf71a01fb0c5e0bdf77433d0ee5acff26feb63c4a40a9b0299ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to a link farm, suggesting an attempt to manipulate search engine results or host a large number of potentially malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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 http://bergepkolcsonzo.hu/userfiles/file/33630038600.pdf In PDF document text
    • http://sozopolihills.com/userfiles/file/95162417230.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109061320053779058tnfm3.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/judavuto.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/pitadinimasodutusorobuzi.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/48163904177.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/53687476687.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/98387276347.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210901/file/56518626606.pdfIn PDF document text
    • https://mar3ol.com/Files/files/79556920241.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/majalubejomin.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/35835953068.pdfIn PDF document text
    • http://chinazzjx.com/d/files/jusukefevowab.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/53519526175.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/liwonukijefekasolanipimej.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/75020695716.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/28687676481.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/98849843556.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/88006705048.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77054234414.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wesafukivunotapa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/enrjmrhg8dkegocf4gj0mdu4f5/lebadijamiwuzuvepozowo.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/78927962171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ideological+basis+of+pakistan+mcqs+pdf+downloadPDF link annotation
    • 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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 11276 bytes
SHA-256: f1c518d93056d8d1e503c2244cc4ca7e75f8cee39e8e8aa3ad480c1372885e4e
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 21460 bytes
SHA-256: 2a56e92701003dbce5bb1587a0b05b155cd3363bd9624c477f29a70a3cbed9c6
font_02_sfnt_off000131ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1