Malicious PDF — malware analysis report

Static analysis result for SHA-256 a103e4f311fff306…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 00:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0007c321587d44e443b1470ed816fc5f SHA-1: 439ce5641283d5c137db3cff8b18d004aedd08e0 SHA-256: a103e4f311fff306c6d0c1112bd7f2c9804c9cef6e109f0854805b3308844c0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the classification as a link farm strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=unknown+market+wizards+pdf PDF link annotation
    • http://inhome360.ru/admin/ckfinder/userfiles/files/ritenavogidilesalamu.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/80975492292.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/jagolaz.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/fuziniwoxolibi.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/33164686879.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/12222839774.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/xesofepobixojonuxaku.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/zerubegoxu.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/68831940241.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/48518908731.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/74607342208.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/92911370343.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/5889960392.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149535788dfd---93669049439.pdfIn PDF document text
    • https://longhoang.vn/upload/files/82760022915.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/vijelajofugonolavegu.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/34384751563.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/mazeveronepuraduwawikuf.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/tivatinijiz.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488c0d1e270---rurudimulufolinaxa.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210914151157.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/47475244283.pdfIn PDF document text
    • http://sayarbobinaj.com/file/pizug.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_off0000aed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED3 10860 bytes
SHA-256: 8097c84d78e7500fade42ce7c2ed9e1221d3b6d15154f3bc64c45386ab1e5cf5
font_01_sfnt_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 15344 bytes
SHA-256: c91cce702e48de951e5453ee608b79536f6de3f467e57ed9cbe42d432a8add29