Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1754dde10b71bf…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 08:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9112cadf48ca82cb812db2243c3afcd SHA-1: 458e2d54c79191480e785f196df3b7d82df3a1a0 SHA-256: 5f1754dde10b71bf2bf88ce507ca66432ce83e09d4d775bfb04ed5a411865d56
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=talk+to+text+app+for+android+phone PDF link annotation
    • https://eownauto.com/uploadpic/files/75531875568.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/kaketefeseretixotorasex.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/bewoxifobagorekurin.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/fumijonitagifebotaxigiro.pdfIn PDF document text
    • http://aven.su/userfiles/file/34922477887.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/zexifozu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ka1q07veeugj68896kbvfb8jt4/54739615516.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/41856171380.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/89369075600.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/kikidodowokadi.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/50456463857.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/59861350537.pdfIn PDF document text
    • http://thecuriosityshot.com/sexeduduse.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109061952004289.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/90491094239.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d1c81a72a9b76e18f0d6927b8651bab/91428250005.pdfIn PDF document text
    • http://zaiger.ru/img/file/sarujejulem.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/moxukelok.pdfIn PDF document text
    • http://kasand.com/userfiles/dupovadigajujejesizov.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/vudirizakuzuma.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/81347518174.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/28645174518.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/38652151810.pdfIn PDF document text
    • http://grimastone.ru/files/41156070544.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_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 17876 bytes
SHA-256: 15c9f6c8d8069f7987268b3bdc50286218880b5aad3267de5133af5dd774f189
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 10584 bytes
SHA-256: c7272e734b0a502e01bb48acdda2be27378108593040a233fe69778ff27973ef

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