Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b923ba4386b4e4…

MALICIOUS

PDF

84.1 KB Created: 2021-09-22 11:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ff35e555fabc6f7611e8b755720b81d SHA-1: 62206ae34c273c334c53cde91a85142db76d8e45 SHA-256: 44b923ba4386b4e41ac6dbfa464c0eac0a4796e4f63ce60ff6f175691a1f259f
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://hankilfood.com/upfile/files/darisuzufis.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec589b6c9---jamefu.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/73092665164.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/dab212392e01e2e2529bb2a04250b422/36279144887.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/ninezupekul.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/83888905054.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/36748953984.pdfIn PDF document text
    • https://gulamanis.com/contents/files/riwawiwojij.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/xodadiva.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/78637765390.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/74851079984.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/kanofuwimuwomepej.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/xufakurite.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/15470485435.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/91007844027.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090900450773499.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/gojirirunowopekududo.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/naxazepagoradekaxamekusaf.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/genot.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/texafotoraxilex.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/popekorisugikudaxow.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/fojixaweruj.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/konavunutubadumigazutezet.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/84554464291.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/jorepegefivezi.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/xuxonagoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+new+pistol+in+warzonePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/60309098569.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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10488 bytes
SHA-256: 8ed600686e6bc0ffb7598deab1ebe037199b350f5219549bb178094cfddf09c9
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 18520 bytes
SHA-256: ef6b057ea667d8b8ac70c9275bbca3006a407ff6cce702d7966ecf512263a62c
font_02_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1