Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b8c4c145580cd1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 12:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce3b2c3d4db1f8ab4c76969216dae199 SHA-1: 37a1f5e5c6dcde67ba7b546f0b117b5067b4cee1 SHA-256: 29b8c4c145580cd1ee066dca940d82541abc54f98b120a94ca85a69a26118edc
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host numerous links on disposable domains, likely to distribute further malicious content. The presence of many unknown URLs supports this finding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://strelnicebudejovice.cz/userfiles/file/vunozib.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c69dd09977---88609231762.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/zipululofuxoburepir.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/12878144218.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/tesaradurumalavibifaved.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/34871442753.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_11_14_43_39_9925.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/wobodemebibu.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/22925117794.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/bakifilememu.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/bumakuzuruzowefemuvuza.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/33061638488.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/30102937467.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/kamosi.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/ravobuguxamefesajaxunuput.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/42106958974.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/pelulirofemufepujajij.pdfIn PDF document text
    • http://halaljones.com/uploads/files/labin.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/zutemevaveduxuk.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/65667503163.pdfIn PDF document text
    • http://usateatop.com/_upload/files/lexagofuposobeworobaluzew.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/mujibeja.pdfIn PDF document text
    • http://atek-ent.com/upload/file/43787023812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=smith+wigglesworth+sermons+pdfPDF 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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 17612 bytes
SHA-256: 7e1cc1b45840e25bac616126a1f1690e18d3e61c3f969902cabc325d5fcf7aaf
font_01_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 10944 bytes
SHA-256: 9071ea8373957019a6510bb8966d453bea82c12431d2828fcfbcb52b8526383c
font_02_sfnt_off00012239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1