Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf52cf7dee4f553…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 14:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46d6b655ad2675113880f061df872546 SHA-1: a636851c3f7ad08bfa8f2e3ae6ae1737a4bb33db SHA-256: 9bf52cf7dee4f553c6c871f5176057213dac2f9499de36f8692a033676ec02ff
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including one flagged as an algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://chcial.ru/uplcv?utm_term=android+su+lumia+950 PDF link annotation
    • http://montoaneli.com/ckfinder/files/8349030920.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/7581922940.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210907_B9DD40D86D3075FF.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/36735375740.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/78410601068.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/70420175753.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/lajaxuxabo.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jesabivizetixilejaru.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/258005107.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/53334587412.pdfIn PDF document text
    • http://hrudolf.com/userfiles/bijasitemasumutokugoxep.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210912195154.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/93278543432.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/sofobevanijupe.pdfIn PDF document text
    • http://centrons.com/uploaded/file/4898048496130e2c2d66ca.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367ef97847d---28344065827.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/92235762747.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/zorefivibokepalafamisun.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/lajel.pdfIn PDF document text
    • http://nprofit.hk/userfiles/ditelixazatup.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/sikunezigujivonaleze.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/10101643530.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/72024977868.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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 18968 bytes
SHA-256: 74ffcd4ec9a49a3d5c3cb312609a40c444e14dd2a4b589264c03410ca4649221
font_01_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 10684 bytes
SHA-256: fda503897ae53d740a15829f51ab53c3e716f015f3d0c92001e2b21335ff44dd
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1