Malicious PDF — malware analysis report

Static analysis result for SHA-256 579f1d2417554942…

MALICIOUS

PDF

90.5 KB Created: 2021-09-18 15:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e4ec5b8180e48fca33f2db80614ba2a1 SHA-1: 9dd158edaa51b71cd31077a39e9ca01de2da28a1 SHA-256: 579f1d24175549424e35f0d8dd95194e38b1ae23fae1b33967b23e58d1d95409
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random and disposable link farms pointing to external PDFs. The ML classifier and ClamAV detection strongly suggest maliciousness. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://grandhotelushba.com/userfiles/file/miwefometojonikudikoli.pdf In PDF document text
    • https://adikkedua.com/contents/files/11556771774.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/72427715383.pdfIn PDF document text
    • http://donghotam.com/luutru/files/84501805282.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/jitowunelaloja.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/dupujezoparisuwiwaguvez.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/1935148078.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/23709963198.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/69607358528.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/78731019632.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/17661128167.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/24421100556.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/862520962.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/posolosofu.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/tetibedifelavevirewedej.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/er8a1b939poof07kpecdvjcms4/fewajavejegigafotodowevu.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/gurimisavavinova.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/36246975637.pdfIn PDF document text
    • https://kermanrooz.com/img/files/togemomomejagipebabuke.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/47654956353.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210901_FC1873F0730FA693.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c31534078---60467529248.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/76975366710.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/xomiv.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/72462679028.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/72665616554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=olympus+has+fallen+full+movie+watch+onlinePDF 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_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 11036 bytes
SHA-256: 1c9da669a6d5b6cd08502fb323ff6057dd69d2192458d31a35e300445dce5cf6
font_01_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 17932 bytes
SHA-256: 2130cc2b715d25996f89d1d573666303b0976a1c6f8e903fe3b2fdedfa30c479