Malicious PDF — malware analysis report

Static analysis result for SHA-256 392e9522d7d2dbe6…

MALICIOUS

PDF

68.5 KB Created: 2021-09-20 03:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f3a662ab06f105f15cc9ef78e96047d SHA-1: 33786582dfee242e632ee79db5d898504436ff0b SHA-256: 392e9522d7d2dbe6d890f1ae85d7976876b623e20d029a7f2f9debb4fcb9776b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. The presence of many external URIs further supports this, as they likely lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://cructi.ru/uplcv?utm_term=is+gostream+safe PDF link annotation
    • http://pop-around.com/file_media/file_image/file/zominifilugojitavevi.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/kugajaxinu.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/dalezikenuvureku.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b899ca653f---83871227872.pdfIn PDF document text
    • http://zeci.nl/im/image/vurit.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/48923516667.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/490859706.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147ced784636---ronapibifobarofe.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/73131855213.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/72187326265.pdfIn PDF document text
    • https://shevian.com/images/file/32914071154.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/36927748610.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/sowefuvafukekoxivixog.pdfIn PDF document text
    • http://stisk.com/file/81511294142.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/worikuwapaxugubure.pdfIn PDF document text
    • http://askaudit.ru/price/52177392949.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/ferutitinawagiraminowo.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/69537332215.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/83879073554.pdfIn PDF document text
    • https://people11people.gr/uploads/File/wovodefifotevi.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/budopakukunivup.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_off0000b0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FD 10268 bytes
SHA-256: f1dfc4f7776c17aec2b8dc8dc2c30d1717131d9d1971d605a25cc2079894c13d
font_01_sfnt_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 14620 bytes
SHA-256: b9735e61888ae04bc3e4d95a9ca5d3717af6e412220cd5fdc8f39a686154192d
font_02_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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