Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc94ff99e6e10284…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 12:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c50116fea039879b548185786c7353c SHA-1: 44efa73f979926037401040baccdadc8dbabfaf8 SHA-256: cc94ff99e6e102846b02dee7432a5b3acbd5ddde786c7bbce5002f09ecdcaa16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://askort.pl/Upload/file/184666226.pdf In PDF document text
    • http://kisito.com/userfiles/file/49475118935.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/31112651304.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/71427168731.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/12legju5lirgrvmh3eh3kqpvrc/politalikixikewasejivadet.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/toxiwovibusifefew.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/buregilavarevoduzezamo.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93817293680.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/23423695626.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/23222445671.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/vesomof.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/61187231262.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/zozasujuv.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/weruvotexuzedemosusekaf.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/17232703013.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c87684b95---xalatolazux.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/78033957455.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wokopisifafamutujunat.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/tezuxad.pdfIn PDF document text
    • https://servicepapik.ro/files/dawemopefupixurupufigufar.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/61375305127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=share+photos+from+android+to+macPDF 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_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 18408 bytes
SHA-256: bb225f4a9f4c7a179b6cbc20cdf9bab600bb79966410d7b61244d46191dbbed0
font_02_sfnt_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 10912 bytes
SHA-256: 89f65e3b4bd83adafb433ec07c40bd80293e5819f62266001ceb6df705544bdc

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