Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ade611b09b3384a…

MALICIOUS

PDF

93.7 KB Created: 2021-09-12 01:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 146a7331e96491bc6fad5d56ec2cc168 SHA-1: b3e0dbf9455915c25cff9fd7b259fdf49ff89e8a SHA-256: 5ade611b09b3384a20d7df4b57e6ee98465181f8d09c82756215f2ca011d7028
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pbc9pbqlo752g9m73hcp4qs1vk/91207154459.pdf
    • https://aksusu.com/upload/files/rupuzexalake.pdf
    • https://smsenerji.com/resimler/files/59504132021.pdf
    • http://ajej.pretty-match.com/upload/files/kukomizuda.pdf
    • https://jjcfurnituremaker.com/userfiles/files/1987590344.pdf
    • http://www.lalorraineperdue.com/documents/30334563998.pdf
    • https://artedeeducar.com.br/ckfinder/userfiles/files/wemuwijikijowabari.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/5797208209.pdf
    • https://108pizza.pl/uploads/userfiles/files/19807469386.pdf
    • http://ankaraeksioglu.com/resimler/files/19516431865.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/mafek.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/9131978672.pdf
    • http://swhos.com/upload/files/tizudam.pdf
    • http://clickvay.com/upload/files/wolerutumidifovabepef.pdf
    • http://whuntex.ru/userfiles/file/7742760478.pdf
    • http://nedirajtebosnu.net/userfiles/file/sosuxaxip.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9213a27d60cfa462957caafe74d48454/12124046914.pdf
    • http://studiospazioambiente.it/userfiles/files/33873163168.pdf
    • https://vnnc.vn/img-hdmedia/files/67743144465.pdf
    • http://heimundsicherheit.de/userfiles/file/89213989051.pdf
    • http://lyzebrno.cz/userfiles/file/zoxigajis.pdf
    • https://myvideoclasses.com/ci/userfiles/files/pikemiminafadaba.pdf
    • https://kalitelivideoizle.com/resimler/files/8885848474.pdf
    • http://myhomeinparis.com/userfiles/files/momufomefegolezajuvudov.pdf
    • http://paoladebenedetti.eu/userfiles/files/60837602096.pdf
    • https://kovtec.pl/eurostyl/photos/file/selulugafepugorakir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ps2+games+rom
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a16.bin
ccbeeb707d79c903c18df3cff8d11f60b32005e2ad227f4d6de202ba3191527f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 18516 bytes
font_01_sfnt_off000139f1.bin
6c93ba68af661f7e49e5d817d5f6c0ec2746ee2445fac5b70e5022489d7a2f2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x139F1 10232 bytes
font_02_sfnt_off00015107.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15107 16792 bytes