Malicious PDF — malware analysis report

Static analysis result for SHA-256 f334ba6f19f50298…

MALICIOUS

PDF

76.4 KB Created: 2021-09-14 07:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05a9b85c1e9361802bc15ca1a47667fe SHA-1: 70c63b3ab7ba04832ce3df9f0eb3a52998279168 SHA-256: f334ba6f19f50298e6002c6187d4638cf6fa4ded41ca3c0825391aaffa9e4ebf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=de+pdf+a+epub+online PDF link annotation
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bedisowanifarimuw.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/51471465609.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/givajiritozarevunewasino.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/30955349063.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907232531.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401c9b39d13---16071133307.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210909200416.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/vemago.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/53396680176.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/61011063109.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/kubovefujuba.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/silixiwidevegilagox.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/mubasusopuvenemudopaz.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/22684521656.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/goxazegirazaruzorefe.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/dufisujegujazeligewuxapaz.pdfIn PDF document text
    • https://nasikampung.info/contents/files/fesavaduvawugivogumu.pdfIn PDF document text
    • http://torgoborud.org/images/file/53621148703.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/72021061342.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/tabadimajaxedajefes.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/36515880126.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/33397721607.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161343acf5e2fd---6988274256.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/bebiliripemaravikudidilu.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_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 17528 bytes
SHA-256: 7319f97e1843906d133ed3762a50293e337de4990f05d9bf3ae22107dc6651a0
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 10368 bytes
SHA-256: 09860afbf58594ca8e38e768dcea6a63922bdf5776c8073771aeb3b5f3ad7e06