Malicious PDF — malware analysis report

Static analysis result for SHA-256 408973a0c9ef27e8…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 01:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0e17a0f970fe7c8cdd9188b78445f53a SHA-1: a9ab0e6d1688f9f1bde9cba17581743bfae365d2 SHA-256: 408973a0c9ef27e832c6c62063d5eef8853cbeb2e9bda2781000ce978ea9ea19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior, with the sample containing 30 links across 24 distinct hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=view+instagram+profile+followers+anonymously PDF link annotation
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/kevevod.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/33834588746.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/96488787936.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0482b1150e792af08aacba18ccdf2448/18121663055.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/8220388204.pdfIn PDF document text
    • https://baptistfriends.org/media/texabikuligozuvawaje.pdfIn PDF document text
    • http://digifast.cz/userfiles/sewaxoparoj.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/wazobum.pdfIn PDF document text
    • http://stefani.cz/fck/file/73719976378.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/40912007186.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/23909400179.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/15093732618.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/26052873306.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sawositev.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/25335224223.pdfIn PDF document text
    • https://zhansq.cn/upload/file/wupakimuwowalefodiz.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/18017959173.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/rogeb.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/bodijaf.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109120842529466.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/88733600959.pdfIn PDF document text
    • https://alpinashop.bg/files/93803240284.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/50208732272.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/jiwepepigowofelof.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_off0000b3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AF 16740 bytes
SHA-256: 01428305e344f7b2511d4e8c05b432f1d6b1bb5beac149fcebceea12ae4ed041
font_01_sfnt_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 10968 bytes
SHA-256: a10c60623dc042162c0adc01fd1ef3645fa749f5deb5d40208a90dafaaa29d09
font_02_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.