Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c819c331c875cb…

MALICIOUS

PDF

81.3 KB Created: 2021-10-05 12:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1aed50497afa5dbf12c503e6c358f222 SHA-1: 5676920c8c826d6005b9ac9a313f4c708c782554 SHA-256: c1c819c331c875cba33abb28c3982e8033fde31522ff1c7ccdd6e4fe364ebecd
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or malware distribution campaign. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://giga-tronics.com/userfiles/files/janofovif.pdf In PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-26/20210926033504756264.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/siruf.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dewawojo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47bbb0aed---xexubapaxanuluka.pdfIn PDF document text
    • https://wonkingchina.com/d/files/zogodemuvid.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/88716991024.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/98159002041.pdfIn PDF document text
    • http://mfahk.com/upload/files/gifunujubapuvafapibap.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/69333869759.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///62862324058.pdfIn PDF document text
    • http://domosplast.hu/files/file/sobixatowoxavere.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/xixukevi.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/6907557169.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/bawepexaj.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/xipesavarasofugewugi.pdfIn PDF document text
    • http://klenderbio.com/upload/files/44582100885.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/lulilujelesesusotikivorak.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/fizamoserarufa.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee447348e1---vizakonuguxomot.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/97631761873.pdfIn PDF document text
    • http://przybyszewski.org/image/file/rovikopoxasanil.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/61814524225.pdfIn PDF document text
    • https://loyd.rs/images/file/mamitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=renal+tubular+reabsorption+and+secretionPDF 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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 10792 bytes
SHA-256: 4da3f15f7c836232723c0567f4031227b97fb3b0743f9a40543d9ed849164f2f
font_02_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 18728 bytes
SHA-256: 905619332be9253a52bbc832e87d6251972f5770130df80f48e3f79555c6cec4