Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1e3f0ae6ee48dd…

MALICIOUS

PDF

67.7 KB Created: 2021-09-30 20:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d226f0d54b6c6f8f25874e44ae69b56d SHA-1: a1b7c2fb23b7e6be486e886a789266aaf6b9783f SHA-256: 9a1e3f0ae6ee48dda97fa8fce29e0f91ba77b9c55562ad941771c1c7959a143d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, containing numerous embedded URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's used to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=the+indigo+spell+richelle+mead+pdf PDF link annotation
    • http://tsraccountants.nl/mailing/images/photo/file/64870183085.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/6872254786.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/47261276499.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/ginizabuma.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/98635015593.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/3276516062.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/pasujifasejafivu.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/davixajuvegolari.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/pexeruputosomopuka.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630536556.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/vudekujepi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f55df200f1---13334980898.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/migozozowez.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/nexatunese.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/vezosuxemakeju.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/29641665077.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/nilopuriwes.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e91af77703---jekotulavigebub.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/67248513779.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/finegojutuxezidaxafekivo.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/porekikokovepo.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/66287278765.pdfIn PDF document text
    • https://techlan.pl/files/file/31425348473.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_off0000ad02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD02 10932 bytes
SHA-256: 21620b62928a4094b7add615d104cd18ff1c68b09c0c7acc93d1a970b18562bd
font_01_sfnt_off0000c5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 14228 bytes
SHA-256: 637e8d820c9d909869fad4384cf8f4a9c4e76bc10afe2d384f6fad8c58f6d998