Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6828a4d29eaa5af…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 15:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 446800a06cc2b3205852f074684c6d9b SHA-1: 0c3b057c4227ea6650da1f2656685f046551aef5 SHA-256: c6828a4d29eaa5af62b04e4665e0a4c355521a7bbf1d3cc7806f1705baaf62fe
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.005 Security Software Installation

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of numerous external URLs and a heuristic indicating a link farm suggest a phishing or malicious redirection attempt. Crucially, a 'Security Software Bypass' heuristic fired, indicating the document instructs the user to disable security software, a common tactic for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://laborke.ru/uplcv?utm_term=benchmark+results+android PDF link annotation
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/uu8s07oacegvrpo2v4qvu0cokt/finiragujuponi.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/nomitexuduvigo.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/jusefojavan.pdfIn PDF document text
    • https://intersat.lv/files/file/57231877963.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/nodajarelusadoxov.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/jajivegexesukibinuru.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/betamukudowaj.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/godebo.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/gaxabinokisexu.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/8468252877.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/sabuwemumutugadepixuvenik.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/53780386296.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/96927791816.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///xulofexotaxopufaj.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/todenuso.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/retabomuluridum.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/kapifu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eedf5b20b3.pdfIn PDF document text
    • https://kaimano.it/file/sukanirinogat.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/dumixisezaf.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/84179530225.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/82651830574.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/8376504987.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_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 10880 bytes
SHA-256: bd8536ff65c9461cd026e14eb73ee6a1278d0f4eb2e696c40bdbce801f478590
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 17748 bytes
SHA-256: 4f888f6334ec33a8b5221348803b1a64f872ab14769d6a08eafae0099f376f1c

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