Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555a896a15fb0ed…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 07:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e4bf4a086b1576de4c3d9647ea73470 SHA-1: b32139551c1b74f9431a42388f3ef0c31491938a SHA-256: c555a896a15fb0ed2ce9d7c3489b371c48f27bc41716850ad46b546cb12481a3
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external URIs. The PDF likely exploits a vulnerability to execute JavaScript, which in turn redirects the user to one of the numerous external URLs, potentially for phishing or to download further malicious content. The presence of embedded JS and external links strongly suggests an attempt to compromise the user via a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=the+movie+with+the+blind+man+2016 PDF link annotation
    • http://cp-1.ru/userfiles/files/lojevirukikipu.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/xumenowatibi.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/65513995576.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/16957442779.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/16062608895.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/zodadiw.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021092108280473499.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/dunutoxezusawirigunojib.pdfIn PDF document text
    • http://upakuika.com/img/file/74283422495.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/xugoj.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/36595262548.pdfIn PDF document text
    • https://rajakedua.com/contents/files/xozirazibevun.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/60142463013.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/49830336686.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/viponevebezavazev.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/zajuf.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/28187644486.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/fireligex.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/sutizovem.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/sovamufudi.pdfIn PDF document text
    • http://ccadl.com/files/20210910020149.pdfIn PDF document text
    • http://sinoorchids.com/image/file/vokamewefekefor.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/lujuz.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_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 10964 bytes
SHA-256: 20fd0448f06acb181626055a84f7bbad0e15be9e71c7c48061410064ba980b04
font_02_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 18556 bytes
SHA-256: 73b5b9f36e58d63eed9da1e26f84e3d42116f78e5c076fa5dbbb825fe057f220

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