Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f0329998f67b8a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-12 15:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a717d8095b96d6289d239b52ac35607 SHA-1: 0840fc179ac651d79f62f8f5122a9d97d9a6c36b SHA-256: 94f0329998f67b8ab91223c95a37143c1e6cd1162b84d61d16606df712a25658
134 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also contains numerous external URIs, many of which point to potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these external sites, potentially to download further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://rowsontw.com/shopadmin/upload/files/84756283929.pdf In PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/18437923865.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/rusexibigej.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/niwejagaboxifisoluselukom.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/dewogugunofuwerorotan.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/nolimobaxosazebavunopiwo.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/warovigasagukepu.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/luwolakudivamuwisuvavo.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/naraxuvawazofiwupabepiza.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd6eb9113---64018146147.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d33bd2ce1f0758f2366cbe92dd02457f/62427438355.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/25924760596.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/volemowu.pdfIn PDF document text
    • https://greenways.at/userfiles/file/52565807946.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/wewik.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/90272657750.pdfIn PDF document text
    • http://sjhtractor.com/d/files/44237473451.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/23735724659.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/31201800242.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/4069615164.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/rewuputawida.pdfIn PDF document text
    • http://alltechsro.cz/files/19527611083.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/71971292854.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/8670420241.pdfIn PDF document text
    • http://gojjang.com/uploads/files/lewopaxegenokula.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/8191109505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ppsspp+vita+gamesPDF 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_off0000c02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 16620 bytes
SHA-256: b7332c2bdf5fbb77daf7617024b5f6e0f79cf26800655197b68b7cc318f24df1
font_02_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 10292 bytes
SHA-256: 58a6bed68177d638f42fc925014ec4ec0c41bcb2cb944a376b70349b06d4c980