Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb74786068ab178f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 21:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 813f9c41eeeccb21cafaeb99e08ce4dd SHA-1: 8716bd820bbbfad1aa6e2a2fbf8cb1fbbd1f185f SHA-256: fb74786068ab178f630897b4f55a999b9579f1c5aa5ba17bbca5842c4acb7ecc
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common attack pattern for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=download+lili+apk PDF link annotation
    • http://jatechkj.pl/upload/fck/file/11791421000.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/panaxuwunifa.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/78078519069.pdfIn PDF document text
    • https://emmaushuis.org/pages/wigujebiruluzitu.pdfIn PDF document text
    • http://progetec.org/userfiles/files/tojusuj.pdfIn PDF document text
    • http://healthywithhart.com/res/file/lukovumiw.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/buwuwowajo.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/jatanegebebab.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/ferudinetubepa.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/luzuzoneg.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/retapuwapewar.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/fagaru.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130d069b6b67---99374674113.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/67190134383.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/38337141257.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/bemaw.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/periluvem.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/89092268091.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210906021748.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf15acd28a---bolulorareresuwujit.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/47059323391.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/75918271587.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/75127607628.pdfIn PDF document text
    • http://all-premium.com/user_file/files/lusadexizetidipov.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/90380758683.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630822835.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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 18396 bytes
SHA-256: e0ba0a4e473cdb859e6f8ded76b5c2f7cba72911f9427bb40309738a822a1a96
font_01_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 10068 bytes
SHA-256: e06207d82f76c74220c4080990d9c2da1361ee247fccbf5e4b09f544b134a7c0
font_02_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1