Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cba7387745d20d1…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 01:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd576e516b182557ed6e1de0c8aa3e8a SHA-1: 5aa7e3b49fccc5a669af1f67c1d1db868193d52b SHA-256: 9cba7387745d20d14e311df6b2ee58f118a52770a870025e9d6d0c2a7521fcde
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically flagging it as a callback phishing lure. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code, and the callback lure indicates a social engineering tactic to deceive the user into interacting with a malicious actor. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elitk.ru/_files/87031079632.pdf In PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/fegomuvubawobujujefiputab.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e1b393e8b084d8032a4a9a178b331a7f/55664410706.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/38661907407.pdfIn PDF document text
    • http://geasit.it/userfiles/files/84337301544.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/82480624969.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/2144056306.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109020013040061.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/gizonutaluzimijime.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/xonazabofatofuf.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/lexozomi.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/45957899314.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/49419847403.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/37840650360.pdfIn PDF document text
    • http://aven.su/userfiles/file/96271739200.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/pefomox.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ib1rbtampqmlobr5jnsnsggi95/zitatuxa.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/60985030374.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/zubugojolimabosital.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/42322935406.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/16775262495.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/jimufegozipulabet.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/dodulevebalogonurizobij.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/55603012045.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/gakunijiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+delete+temporary+internet+filesPDF 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_off0000c254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 18396 bytes
SHA-256: 5e44bd04acbf577c17c7d2e5dbd067bebbaf3288da867f89723187470d861c57
font_02_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 10852 bytes
SHA-256: afb4e38266d623a41f8b6cb505494737a14fc82aee590d7425c7b55f052d972d

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