Malicious PDF — malware analysis report

Static analysis result for SHA-256 141d8b514cb0bc17…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 00:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff17fa8046df9027e7317dce06283707 SHA-1: e995b6eec350a4c7561bde96eaea43982b5aa7bd SHA-256: 141d8b514cb0bc17b47e142f4d96868c257c3bf9df696ecac49ab0b0c2224719
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many links on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and link farm behavior point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://sdhouse.info/ckfinder/userfiles/files/rutogaw.pdf In PDF document text
    • http://cabini.it/userfiles/files/fubupiz.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/womixud.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/61719517195.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/tilokasipepatasagowor.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/gibokix.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/79621578232.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/kurelinidifus.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/xuriw.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/52011200287.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/40846158163.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/75256182655.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/73517871059.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/92470833066.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c46dfb9345eed5034721b008fdfda41b/lobosifusiwexofegelajofum.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/84139494060.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/28499035411.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/kiwasixab.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/0375bea22e8fa3a520d3a108c64c6bef/82882753485.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/wifaz.pdfIn PDF document text
    • http://sireny.net/share/files/16952314445.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/38343673629.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-16/20210916133534869075.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/92413521470.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/6747679275.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/62936843881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+tv+store+near+mePDF 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_off0000c143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC143 16308 bytes
SHA-256: 04ebc2437a88ac51f988fbf56309918f8201eae1befa53b1a38805a71f1850f8
font_01_sfnt_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 10412 bytes
SHA-256: 1c7facfbe884aa8e3a175808a3a5d1ebe20ecf44a0c29dbb64ef0f9d42a793f1