Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b503b8262808ae…

MALICIOUS

PDF

84.7 KB Created: 2021-09-23 05:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5311006e885d83f1fbe003413731b7e SHA-1: 0536899eb90ca8e53078859f1c18d464f4518348 SHA-256: d2b503b8262808ae269746fa74f1429c0ac4a6beb1071da28089177ce2735054
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially malicious files, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, suggesting a lure to trick users into downloading a payload. While no scripts were directly extracted, the malformed stream length and ML classifier indicate exploitation, likely for client execution.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/881bd4af13323170ea78f02b53ce494e/nejesiv.pdf In PDF document text
    • http://dsfly.com/uploads/files/dalekubimozi.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/35967266147e9c4b37d0.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/18535293471.pdfIn PDF document text
    • http://agama-rc.com/upload/files/lorodosomaromemotugajar.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-2/20210902011203218208.pdfIn PDF document text
    • http://qdjshg.com/files/file/63652592884.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kotet.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/52644257855.pdfIn PDF document text
    • http://bubb.cn/up_file/file/jovasodolenagami.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/ruwizokavobo.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/94167962348.pdfIn PDF document text
    • http://elitk.ru/_files/wuxogeluzajojokoterowek.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/xiped.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/feririkiv.pdfIn PDF document text
    • http://venkateshservices.com/uploads/46929293806.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/tepewulisoj.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/70818283953.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/41315874083.pdfIn PDF document text
    • https://makenie.com/upload/files/96831401586.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109100432346012.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/6333114174.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/90336671227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wrong+turn+part+6+full+movie+download+480pPDF 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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 11492 bytes
SHA-256: 942ea661402ac46cd5da69f63acdf4a9324aeb7c01fe7a90352675d50ed83a51
font_01_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 17672 bytes
SHA-256: c5659150177245549eb9d80c2d224f6cd01b0ea0a9df6b74fa78d2937e92c5e6