Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e28ca0811966540…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 15:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56372238b6a6425ffa253dff29d5d3bd SHA-1: d92d3c2c4c45539e8fbb7c52b9a688b60c86919c SHA-256: 0e28ca0811966540542b574d54ecb10b1f51a77734170e4d8ff9f5df8241a0b5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to link farms, suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://atlas-consulting.ro/fckeditor/fisiere/file/sunabikatexilewasiram.pdf In PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/vatejitimopikeripaz.pdfIn PDF document text
    • http://oilspecchem.com/files/32330530014.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/puwugonifatefodenefu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79ad73182---19497111735.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/kiruvapof.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nerifavowizovumite.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/wexojutosux.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/kixuxesix.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/77991934961.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/82747793347.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/95053230767.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/kukifuk.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/74848279653.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/46573430232.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/92908616864.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/lobujodafujukubaxijagitub.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/jugipo.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/62210006164.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109071922069086.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/99771851491.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/tovavalogunaroneroxil.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/pazukufeluwuzosi.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/ziwavovirux.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/pokt9tish3keakbfebgc416qq7/31801482594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=porsche+gt3+manual+for+salePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 10964 bytes
SHA-256: bcf70d6758f9a5f86b626c7d8f21b55e8b8c4857a8eca7d61bb9e4cb4ea725d6
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 17968 bytes
SHA-256: 49879dc70296bcc93b5e90bb6ea9a38823298ef9a2e70d3c2219e968fc997e53

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