Malicious PDF — malware analysis report

Static analysis result for SHA-256 3214fab83b21901c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 14:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9027e380725989c18c7d585c706d638 SHA-1: 7671895ee7e552efed79277b4aa31288cfdd2a97 SHA-256: 3214fab83b21901caba8bdfd59bc9369abd04894b033912ec5181f6a297eba32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=metodo+perfetti+pdf PDF link annotation
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/ruwavebesepi.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/42253546329.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/varavikebakoxoxutiwit.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/53418948525.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/befirilotowo.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/18832423558.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81111603800.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/57286007884.pdfIn PDF document text
    • https://suksesunited.com/contents/files/rarevetulalukudoragu.pdfIn PDF document text
    • https://ayurmitra.com/files/file/99181964484.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/pivuselofijutuzi.pdfIn PDF document text
    • http://apvn.info/userfiles/file/maxekelelonuxom.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/47657563586.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/82795495972.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/45727249423.pdfIn PDF document text
    • https://beaszemin.com/files/54832040479.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/90904001124.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/66629054426.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/20969280691.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/80995591818.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/dipelerag.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/88976131271.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77e2e72b3---pogimeboja.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/89454016943.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_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 10004 bytes
SHA-256: adc6bfc19dd7e4430e2e8519dc2b177b850587bdb7ca4188e2103555978ed103
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 18196 bytes
SHA-256: 75f09d9b3761cf42dcf1a31a169119d9b8b02f0d7e2c4d3a7c78c8d2af629b48
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1