Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d40726dfe2b804…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 11:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ba71276f8105b8ea960f6b27dec700f9 SHA-1: d69fe625a7f84db0b82d55959dfa042484e2066f SHA-256: 19d40726dfe2b8042ffd61d3e558e9309a094167c8297ccdfbacf9aaf53a049f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous distinct PDF files hosted on various domains. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e69b026a1---6967323631.pdf In PDF document text
    • http://bookblog.kr/data/file/files/viledigajapise.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/lolukanafasamupiba.pdfIn PDF document text
    • http://szcftz.com/upload/20759309756.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/memijosulopadikugejemob.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/witixumesigetovegapuwesi.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210917092921.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/78377472246.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/19401019420.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///88696477239.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/gufoviroxaruja.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/41599260955.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/47837087414.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/68930864025.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/pemaduwumuvulonuv.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/gipoleligem.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161360b9dd3f7f---wogavimovutidakigeluvu.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/voxanodasoz.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/40676445440.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/zedan.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/zasutazejapejuxekatu.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/savepanikamesuvawer.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/56407783117.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/95898608750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+fifty+shades+darker+filmywapPDF 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_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 17804 bytes
SHA-256: e27218437ae7691acaa1134e8b6cf44a455ea27c18b39b49ca6991581252989c
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 11056 bytes
SHA-256: 5b627b67e8d8659185e626ca230bb8af3e1e55cae770b70b1236b0930c683bbb