Malicious PDF — malware analysis report

Static analysis result for SHA-256 505f4b9338eb65ae…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 19:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2d94c680827ee93be8bda6b39bf8699 SHA-1: fd24a20f30aebc29c50c746784c7b3adc2388274 SHA-256: 505f4b9338eb65ae881332be8044372e9f43802828f097afea346ea326f7b76b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malicious links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://l-max.ru/userfiles/file/mowoxoturuduzomupaj.pdf
    • http://kbidc.kr/upload/editor/file/1630868298.pdf
    • https://bselink.com/userfiles/file/nikudanan.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/14844425765.pdf
    • http://tbeaindia.com/userfiles/file/mazutopiwodebabimo.pdf
    • http://www.slenderclub.cz/ckfinder/userfiles/files/vazelekakiwibaliriluvolo.pdf
    • https://petpetmates.com/files/editor/file/mafexuxurapagu.pdf
    • http://cantinachitarra.it/userfiles/file/wegowekugajad.pdf
    • https://adverto.ee/userfiles/file/44234327932.pdf
    • http://ecovn.vn/uploads/news_file/920866896.pdf
    • http://china-baby-clothes.com/d/files/17931432729.pdf
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/62785519803.pdf
    • http://mebelhotel.ru/userfiles/files/xasunipamowen.pdf
    • http://sl-light.ru/design/img/upload/file/pajipuvonelujezetonosak.pdf
    • https://cobaltinc.org/userfiles/file/30138465696.pdf
    • https://satybharat.com/ci/userfiles/files/65811112101.pdf
    • http://erainbowrealty.com/userfiles/file/bilimorujudo.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/wonopuzotasubido.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d509447ee---pafisi.pdf
    • http://aranykoronakft.hu/userfiles/file/1755809680.pdf
    • http://ks4073.com/file_media/file_image/file/poxudujirupuroxosejozuse.pdf
    • http://tuderprogettazione.it/userfiles/files/bibizurabunu.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/95397382573.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/sojelodawubupusutuliw.pdf
    • https://kvizek.hu/ckfinder/userfiles/files/muzukedifujevelekimaxur.pdf
    • https://cubic.is/userfiles/file/fufomotabifuvaf.pdf
    • http://matstravel.ru/userfiles/file/dexofogamoxuxemezu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+valorant+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e171.bin
8422aeb74b1a45e5b0777a7d306c4c4571f57ced5b8aff6d3ac50dd9f270b745		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 17000 bytes
font_01_sfnt_off00010d7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 16792 bytes
font_02_sfnt_off00012595.bin
1210535bc67da288b1081999eb4c8db882455a37c3dec847446d594a89a906f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 10092 bytes

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