Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d095563cbdeed1…

MALICIOUS

PDF

73.9 KB Created: 2021-09-23 19:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05ed20e2487b2d467df2d998229e5b1d SHA-1: ca95ddeb90ef43ec51a40fb446233cec62b391b1 SHA-256: 25d095563cbdeed1c3e48c5247574c443a78703159b73c54ed6430986d89f38e
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it may attempt to exploit vulnerabilities or perform malicious actions upon opening. The presence of numerous external URIs, many on disposable hosting, points towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://philabc.ru/uplcv?utm_term=self+reliance+waldo+emerson+pdf PDF link annotation
    • https://urbanlivin.lu/userfiles/files/futixofugupakizeguke.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/pifijowamegulogepib.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/nopupavosaxenawewu.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/63178785174.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7n0i2i0fu6e0e2jg6algo5imv3/50735256246.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/6572385248.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/jusuposulemenexukexabofen.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/fozagozatuvunilabima.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/mivosafom.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/91910204957.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/30254306273.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/gakijinepatibivaribuvig.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/45252156723.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/50544251706.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/36223122050.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/89188209475.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/799399302.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/pofubepazobijowov.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/tesawigefot.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nidodi.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/pitokifeniluzo.pdfIn PDF document text
    • http://ping-property.com/user_img/files/gaxikizozitobojusel.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/viwakef.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/lexigipokagefotujovi.pdfIn PDF document text
    • 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_off0000bd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 16876 bytes
SHA-256: f2be98b9f207a5b7d29b327ef041cd466b07e2a16b8917852789ef185547dacc
font_02_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 10844 bytes
SHA-256: a8a45628ea3f14ae4f79754dc9d00a083e7d4dc8584e53bd68d24769e025dae0