Malicious PDF — malware analysis report

Static analysis result for SHA-256 28acbde27bba675a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-11 23:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 068c17266639c2473daf472295f74a7c SHA-1: 5371018a7ba130c56c501f56e9939f438bcc9a22 SHA-256: 28acbde27bba675a23a5efd400413d599bf86d8cc93a56e20e88000318624220
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying it as a callback phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely used to facilitate the phishing attempt or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://epoptavky.com/is/images/FCKeditor/File/jatirejajobofizobuzej.pdf
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/85264560092.pdf
    • http://commune-bourre.com/userfiles/file/bosumukezogubakafaket.pdf
    • http://sirinthepgroup.com/userfiles/file/kelifimodemalafajitixane.pdf
    • http://secretinvitation.net/images/files/24907060128.pdf
    • http://jgweld18.com/UploadFile/file/20210901133053753.pdf
    • http://schodylux.pl/userfiles/file/fipixigepi.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed279d919d---dubusebinogumekunom.pdf
    • http://feriaalainversa.com/uploaded/files/87306709182.pdf
    • https://alnahamgroup.com/userfiles/file/kevunofet.pdf
    • http://ibarugi.com/fckeditor/userfiles/file/88951137726.pdf
    • http://bayanairag.com/uploads/userfiles/files/puzokiwivezogow.pdf
    • https://bustotoronto.com/userfiles/file/7843959334.pdf
    • https://inprovitcaribe.com/ckfinder/userfiles/files/pobon.pdf
    • https://buddhaart.in/userfiles/file/15014872578.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9a3d491c4a657baec1f81040b7dacedb/ralefopenifozepaneruliwof.pdf
    • http://otpetye.com/images/shared/file/weriwikazuvitagemasavebop.pdf
    • http://ktai.lmg.jp/upload/file/tareroxiz.pdf
    • http://carnow.jp/js/upload/files/76870235031.pdf
    • http://flairpens.ru/uploads/file/bapezesusejijugulowowa.pdf
    • http://skisun.it/userfiles/files/91614998163.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=solus+dual+boot+windows+10
    • 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_off0000ee47.bin
fb23db195b528bec0f0a3b3440d1f3ec7c113e4a8272aa58457a564dbe7eebf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 10584 bytes
font_01_sfnt_off0001069e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 16792 bytes
font_02_sfnt_off00011eb0.bin
12e0d7d377b538c756261b4effd1b5a85b19a0cd833b02b3c1b14ab868ae0db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 17064 bytes

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