Malicious PDF — malware analysis report

Static analysis result for SHA-256 0216750e639972d4…

MALICIOUS

PDF

89.7 KB Created: 2021-03-18 05:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5f3ccfd459e22bad36debd45a5bdcb04 SHA-1: f644105092f652547dd1922436ad1b31752bb63d SHA-256: 0216750e639972d4b03c9218460abe92801795b3412574d3ff9c545af8a6d330
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier as malicious. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host many links on low-reputation sites. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=palacsinta+recept+b%25C3%25B6gr%25C3%25A9s PDF link annotation
    • http://carbags.site/snake_vs_block_cool_math_gameshhng6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379614/normal_5febce8854598.pdfIn PDF document text
    • https://rejaduwewuwuga.weebly.com/uploads/1/3/1/8/131856140/8560018.pdfIn PDF document text
    • http://fishland.store/kali_linux_revealed_bookeexdo.pdfIn PDF document text
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/kurere.pdfIn PDF document text
    • http://vehicleusains.com/mutual_fund_investing_for_dummiessfo56.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/what_specific_techniques_are_used_in_the_cognitive_behaviour_therapy_cbt_approach.pdfIn PDF document text
    • http://meetly.space/what_protein_is_alkaline1jh4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_604325a8aae72.pdfIn PDF document text
    • http://muslims.net/49933133031bcswv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fd3194c91eb4.pdfIn PDF document text
    • http://larebalin.mypressonline.com/depaburapa.pdfIn PDF document text
    • http://skidki-day.site/aptitude_test_for_class_10wz7s4.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/48855934427pyqdf.pdfIn PDF document text
    • http://storeeuro.info/kiss_the_rain_sheet_pianoa62xi.pdfIn PDF document text
    • https://nemoderi.weebly.com/uploads/1/3/2/3/132302766/vutaxarevotes.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/quantitative_data_analysis_techniques.pdfIn PDF document text
    • http://wide-take.top/foxit_printer_missing_after_update0beng.pdfIn PDF document text
    • http://instacopyrightcenter.com/flying_arrow_broadheadsb0vnl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_211239fa61714192a6292d62a06d0a34.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_591344b196554484af7ef22516265e6b.pdf?index=trueIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_7bb59b827ccc461ebd359aa9cc94e1c8.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 3056 bytes
SHA-256: 69af8e147acd4ce2e7a00d68a854e0936fd434da26172ca330cef86f12173931
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 5524 bytes
SHA-256: a0429eb3aafd9c157320cb6003122e9eb7f13a8bfb812a6f88107722f5293f77
font_02_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 6148 bytes
SHA-256: 4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157
font_03_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 12920 bytes
SHA-256: d1b950f1c995e9abc701616460af652b0f09f7ee82262c38061ae6a48797f3c1
font_04_sfnt_off00013f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F67 16684 bytes
SHA-256: 4cd55fee6c52bbab32ed20b0b25846bff407090075fa0ab45dc9808449a8eeb0

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