Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f269a871cac34f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 19:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5397f26f7c87003ab19aa1b627dd6579 SHA-1: ec9ec690c988e384696a699ace487ac6e361acc1 SHA-256: 77f269a871cac34f663fbd2b8b9cd6921d41624880c0f4fa5cb41b7b0c77c699
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. This suggests the primary purpose is to redirect users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alrashed-alsaleh.com/userfiles/files/pofogogotakerinonikapo.pdf In PDF document text
    • http://slavutich-media.ru/userfiles/file/taroxoroxomizelijed.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/46659440928.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/watowixezoraja.pdfIn PDF document text
    • http://519pf.com/userfiles/files/36053373744.pdfIn PDF document text
    • http://119pump.net/d/files/61613277095.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1858c26ac---jiwufajuzagij.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/gudatiroxikagadu.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dexipixunijiromaloriz.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/vetojoruvipunelekulu.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/rored.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/lejudogejomitimojaretapum.pdfIn PDF document text
    • https://armenia4d.com/contents/files/16976826908.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/80197799906.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-18/20210918010806544641.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/88110938819.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/zajorewal.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/30246672.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l46pvgf7gg33cit2bobsqou9j4/97345121251.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/tosidubototunawiv.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/fegilo.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/zuzamel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=world+soccer+league+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 22048 bytes
SHA-256: b97249178c7f7f11b72d32ef8c33d889f2fc028bafbab51960db7edb51def5db
font_02_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 10748 bytes
SHA-256: 6cedcd85980734f0ebc7003d702c2d923413b2a5d3d4ea45d5f38c1f3f72f2ba