Malicious PDF — malware analysis report

Static analysis result for SHA-256 699958e0ddd0de41…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 14:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3409cac898bca2f58dd1f6097e019fb SHA-1: 489a66d2892aec8f64142294a75b7c5d079589ad SHA-256: 699958e0ddd0de4143376b6f6129d6f6417d7c9737f7a2e2bc88ef453e0fc17f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, many of which are link farms hosted on disposable domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination by using many distinct hosts with minimal links per host. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics strongly suggest the PDF is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=game+creator+apk+full PDF link annotation
    • http://razzledazzleevents.in/userfiles/file/natutikodiwiwovadokifixam.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/zijibegijaza.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/temajuwi.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/19854964763.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/26486378093.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/zebidosinepatalaten.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/58212839113.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/makutejodutobap.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c96e2df65---20827392799.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/66032973992.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/70619969686.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc100388d4---46452970467.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/misubagikizaguleni.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/70422998102.pdfIn PDF document text
    • http://ashioke.com/images/library/File/75455011742.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/nevifasezemab.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/fidobexidow.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/81385700344.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/75873586011.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/kenitavikipufip.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/377985463.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/32074359755.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/3383568062.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/41394075816.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/devufimukubupovurebuzip.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_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 17484 bytes
SHA-256: 61fcf60cc5114806cc5f2136f40514bfad52c2012f7727ccea36d8af6a94deb5
font_02_sfnt_off00012b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 10508 bytes
SHA-256: 71cddcc5bf5ae49155783d0831df4db9f1c3edebc8fbada9ef1bebec4f732b7d