Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ed917fb546ca87…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 16:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b6c924d1f653351aaa3399da92e9dfb SHA-1: dc4b4bc1f78048d03d7232671c795ce11bdd91e7 SHA-256: 26ed917fb546ca8798681937d3b2e3a0feabcbe06be09c32f071e92f642edf77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external links, some of which are hosted on potentially disposable domains. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern aimed at tricking users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alternativi.brtim.com/uploads/wysiwyg/files/zolivuluv.pdf In PDF document text
    • http://kjphotocon.org/data/userfiles/files/mibipidukekanazig.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/lufinox.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/fokiboxo.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/nugilenonusizobolura.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/vasejowetapezesedis.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132264ba9936---62694686522.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109090346555065.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/87934491606.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/74016907814.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392231a722c---15850555386.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/29249726017.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/58365859345.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/7867089321.pdfIn PDF document text
    • https://porfic.com/fotos/file/dativ.pdfIn PDF document text
    • https://senegal4d.com/contents/files/2295525268.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/nevun.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/78057096464.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/vefilatepipibufodijowan.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/sexasisumojadatinixilako.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/giwiruferagapegunozodej.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///92843634574.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/pinini.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/88748780625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=btd+battles+apk+mod+iosPDF 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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 18184 bytes
SHA-256: 46f27de9152cd58580389333706679de306202bb5417ce2871ee7f5ee4c8e376
font_01_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10632 bytes
SHA-256: adf745424fe965e6ad1ec1c19a94510f73ef64307c57de46a7d212cfb8ede249
font_02_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1