Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7313bd8c2713708…

MALICIOUS

PDF

77.4 KB Created: 2021-09-20 17:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ed8a7348b5b2011d8d56dc0a638cdaf SHA-1: 23b0210f4e2627a02a3a85a5cdf46fdd322adc42 SHA-256: b7313bd8c27137086553b18d54abb62c52c10100723595f269978869070a3651
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to interact with external resources. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. The ML classifier and ClamAV detection further support its malicious nature. While the specific JavaScript functionality is not detailed, its presence alongside the lure heuristic points to a malicious intent, likely to facilitate the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://namhungholdings.com/uploads/ckfinder/files/zelosomipuvadaka.pdf In PDF document text
    • https://ccaquebec.com/userupload/files/pufotemuzofikaporodusam.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/walopoxoxafuxobit.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/97749812634.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/41178053466.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/82458699141.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210906_FFAFFB5289E2DE51.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/6839158262.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/80229454746.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/jenix.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210913_164929_4242.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/sapawugolebavi.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/zasosagurogalefagulakin.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/logak.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/75333659707.pdfIn PDF document text
    • http://na3.it/misc/file/rumewanagoredejubudowal.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d07ba5af8---17852840491.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/32951237674.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/45615820583.pdfIn PDF document text
    • http://hrudolf.com/userfiles/70582028885.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/73658140367.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/43323797950.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161341ee6cbdd9---30494256378.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/jadedapufetekerevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=x8+speeder+domino+island+terbaruPDF link annotation
    • 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_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 17308 bytes
SHA-256: 722b2b90af73477257000c8630a82ae6bb44be2073c1df3ede4dcaf0bbe6ef7a
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 11008 bytes
SHA-256: 73ae1b58ccf872518885bf276ebdd749d1173a0976057d5179aeca1ae53faf72
font_02_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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