Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4421a4b964f83cd…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 07:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5e898eb1aa70e5bc93208460c216d0b SHA-1: a0f7efb54ede502981d704188b83d8b82f66d927 SHA-256: d4421a4b964f83cdc1d8edc3ef59a879b5b3f2731c448a85e3991416180440fd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://coretry.ru/uplcv?utm_term=sims+4+seasons+free PDF link annotation
    • http://evrokomplekt.ru/userfiles/file/nefaruduniwexodanepano.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/42137245226.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/59219992523.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/65312967691.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/24593663246.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/88104571210.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b7rleonuoik3nrvh84o7h7vbe0/63166582162.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/jominubogoxepodopitagomax.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/26412193653.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/misekeselonozix.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109140345024858.pdfIn PDF document text
    • http://ausafe.net/images/art/files/29861453895.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131588f00d4a---91522435223.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/suvepelefuwase.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/winivoritolinu.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/fogibuwu.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/lixuvogef.pdfIn PDF document text
    • https://granitnet.hu/editor_up/naxudulatunomup.pdfIn PDF document text
    • https://shunnasato.com/69621370137.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/49309682178.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/65438265280.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/31145440303.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/49245692256.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/83557574657.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/kejowuze.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/53465370104.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/96242901378.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_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 16916 bytes
SHA-256: cc7211121858c1a366e59c7a5eab69f6e76d612ca99628ea3d1dfd2ac1a4feec
font_01_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 10384 bytes
SHA-256: 46e3ec948a3b5803a0a265558d8f4a13e69758f454e0beec03d271186144899c