Malicious PDF — malware analysis report

Static analysis result for SHA-256 a308b381c9c198d8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 02:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb517730b275b88ab4785e86d1b342a2 SHA-1: 83e1d720c426ff9fcf4ff79143b8eebecfc1402c SHA-256: a308b381c9c198d8d0aad12e860a355c5647c058cfbcb852f3932a443427b9c0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of credential harvesting or callback phishing lures. The document's content, though heavily obfuscated, suggests it aims to trick users into providing sensitive information or calling a fraudulent number. The presence of numerous embedded URLs, many pointing to potentially malicious domains, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://willowslakerhea.org/userimages/62949732979.pdf In PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/dizetiguxuj.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/71491186532.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/77715850320.pdfIn PDF document text
    • http://oodow.cn/upload/file/210909132315109578l9e7vh6j16jv.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/91091962826.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090603290060.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27715122145.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/zatuziru.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/kujivoxedanoriralozeju.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/91582268139.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/66487920571.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/sadepiwiduzebi.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/52208767290.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/52211966987.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/25188493627.pdfIn PDF document text
    • https://reha.bg/content/upload/file/butanixatarimen.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/10183446539.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/6953224483.pdfIn PDF document text
    • https://mattress-leader.com/media/xiburotebopa.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139363469436---34151099667.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/3d5f4ec041919e0c3c9a60a5e005a0cd/tezikujatevarulumupomeno.pdfIn PDF document text
    • https://mackbeks.com/files/file/43031235979.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/42879913401.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/kesama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+cancel+my+hotmail+accountPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 10656 bytes
SHA-256: cfab43fcb002156aefbeb4dfc481ee4d3f5edcafc794710e0f033cfb908c4a13
font_01_sfnt_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 17472 bytes
SHA-256: d31c09b81e6059d2ecde7207ff2ae14c909bfae1c669af1c1ab7284cc62c60f4
font_02_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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