Malicious PDF — malware analysis report

Static analysis result for SHA-256 3162626add3b80fc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 17:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9ff89989b275abfee69bb1ecb430922 SHA-1: f5eefc4adc9b206271f8ad0c4f2c0cec46583d0c SHA-256: 3162626add3b80fcc2e34ab1e05887ec7f45c250333dc44e340d83803b55feef
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. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection service. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF for containing a large number of links on disposable hosting, reinforcing the malicious nature of the document's content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=high+road+movie+free+online PDF link annotation
    • http://nuuts.mn/uploads/assets/xuvesolixulexab.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700439df35---lakitexareje.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/kodevujowepofaj.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/tuzuteras.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/75757998227.pdfIn PDF document text
    • https://o-dance.com/upload/files/75413004964.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/xaraxubelenona.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/30932450356.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/dogalokamidogudovika.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/3683288105.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/jojuvabir.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/65059971179.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/kanud.pdfIn PDF document text
    • https://angkalaris.com/contents/files/12962400675.pdfIn PDF document text
    • http://placc.info/up_image/35661504787.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/zimawadojo.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/puwedebol.pdfIn PDF document text
    • http://health-bridge.in/upload/file/16579374962.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210904182623.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/75748836811.pdfIn PDF document text
    • https://turbooto.vn/upload/files/zapopiminubi.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/43825265386.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/40173439300.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/pipevamiruluvevomagu.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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 17484 bytes
SHA-256: 5768ecc433a37c4154a3743eec19d0ca68f3da4dae160c5fa275b851aec6ea59
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 10592 bytes
SHA-256: a9b25f933d582c13aa6722f03c037248f565b7d6489e68723a65d6ecbd275d12
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1