Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17c33c189265bd5…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 18:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bff2ed35a4c0016a331c665452b5222 SHA-1: 7f05233b4e442d1cbd996a5274202573047f738a SHA-256: d17c33c189265bd5983b3fbf65b935ade80cb87134d9f91c1bfae1ef8fe7d5e9
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates social engineering, instructing the user to press Win+R or paste a command, which is a common technique to bypass macro restrictions and execute arbitrary code. The embedded URL suggests a potential download source for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://pixomot.ru/uplcv?utm_term=how+to+take+off+safe+mode+on+android PDF link annotation
    • http://traviet36.com/upload/files/pelojodutukadotexumozofer.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/xagawajadumigirabo.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/41061260894.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/26630994071.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/21617578305.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/50000498526.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/kegerosebelukapoku.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/53098508979.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/99697812124.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/ximesur.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/tezofejonasujuna.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/4811119392.pdfIn PDF document text
    • https://europartner2.pl/uploads/jixamo.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/towopexeluvavogeseju.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/18889085852.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/donazasad.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/59770181387.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/13529242272.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910072434.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/76760948573.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/41628750657.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/duxibujegozer.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/60847283982.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_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 10640 bytes
SHA-256: d9e7e18c4a328dabe7225f5e9c4264bf48a6972873e1fc82e126338b16f687c1
font_01_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 17892 bytes
SHA-256: f7633f7184b13fb8a84380ac1c8b2a482f9e81e7e415a4f243d5bfd48a7be12f
font_02_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1