Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7ff37b62edeca6…

MALICIOUS

PDF

70.8 KB Created: 2021-10-06 01:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0632aca1c88d1e8562a404aa2f4540d7 SHA-1: ae87217fa95c7994a7403fbb06768a5d342a6d89 SHA-256: ac7ff37b62edeca68af399e07b8e5092ebc7bc64f1a8a71fbe96bc7596fc200e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it functions as a link farm. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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 http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/wopodukov.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nt7tfsd8dhiopi7oh7csvd57d1/xalugugixasejafena.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/25249452527.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faca541700---minajivuvumaxudet.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/nonuxukupefi.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/muxabodomif.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/jupimabudekizodavaja.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wupaxekap.pdfIn PDF document text
    • http://www.og2c.com/images/file/67454240253.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/xerikojadozojumox.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/dudagemufijudef.pdfIn PDF document text
    • https://ms1oke.com/contents/files/2317892559.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/rajamuwajafetowirowina.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/58603741336.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/50456463857.pdfIn PDF document text
    • http://shosholoza.de/file/kibojepogukinivaloma.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/84005597853.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/61661337487.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090714581667.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/39382929597.pdfIn PDF document text
    • https://vientangluc.com/upload/files/tabofavevuzovumazelepizer.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/dupule.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/8191109505.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/kuvijosaxaludexafiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=transitive+and+intransitive+verbs+worksheet+with+answers+pdfPDF 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_off0000b461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 10896 bytes
SHA-256: 1a83da321cd6eaa2e2ab7d29414befa8da1ff405aca90e044badf139e8a81eed
font_01_sfnt_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 15680 bytes
SHA-256: c86ce593424fea41b2255d6306d8252185d75582e5681e209d4f29af70cbc881