Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b29a52aacb603e2…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 12:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3281002b195f3525931651dd17041318 SHA-1: 9a5afa923e1233635958df1386753f3504e35c96 SHA-256: 1b29a52aacb603e24ab14f3da81660589557a565ba19543384bb81a7ce269834
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Heuristics indicate the presence of external URIs and a link farm, suggesting an attempt to redirect the user to malicious content. The 'SE_DOWNLOAD_BUTTON' and 'SE_CALLBACK_LURE' heuristics further support a phishing or scam-like attack pattern, aiming to trick the user into downloading a payload or engaging with a fraudulent service. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://onsijsselstein.nl/userfiles/files/ginapisivimenanadejameten.pdf
    • http://hexindechem.com/upload/files/veginivulofegenakefa.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jegibupenidabikutodabo.pdf
    • http://dubilex.com/userfiles/files/budaselukiboro.pdf
    • http://webinaris.blog/ckfinder/userfiles/publics/files/40156508352.pdf
    • http://bmfjhjk.friend-match.com/upload/files/rowokapu.pdf
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/vowikuve.pdf
    • http://senvietsystem.com/ckeditor/upload/files/kixevisosegasenomiganu.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/32478815370.pdf
    • https://binarbaid.com/public_html/userfiles/file/dikukijixigubegawurade.pdf
    • https://n-zvuk.ru/upload/file/74346421029.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/bogodetizejidiruporok.pdf
    • http://xiangzhuan.tw/upload/files/26730255340.pdf
    • https://marsanz.pl/uploads/fck/file/kebanalivofelegavejizogim.pdf
    • http://maslag.eu/userfiles/file/16771322309.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140892186663---wesujikilikurebukiroxuxu.pdf
    • https://baruipur.org/ckfinder/userfiles/files/nulijifovenutonanefati.pdf
    • http://hoteldanang.com/uploads/images/files/69220522773.pdf
    • https://nabsangram.com/userfiles/file/76310795228.pdf
    • https://maxflowfans.com/userfiles/file/nigetakifud.pdf
    • https://careersourcechipola.com/files/public/4013674708.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/60160705471.pdf
    • https://nabsangram.com/userfiles/file/21223220698.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+spoof+phone+theme
    • https://mediaget.com/userfiles/files/gexupixigigid.pdf
    • 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_off0000fa0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 16792 bytes
font_01_sfnt_off00011220.bin
c8364c0822392dacedd12123b44c88bdd630efca1c8f40786f1fba1981f8cedf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 17328 bytes
font_02_sfnt_off00013f0d.bin
1dfb5af779502a4dd920fbd8bc417f8447eb87d4c7e7b8f46cbbad043eee3308
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0D 10204 bytes