Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68cf918b777f935…

MALICIOUS

PDF

82.1 KB Created: 2021-05-05 12:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e33863df83a7755afcc3c6b535051d06 SHA-1: c0531bc42645ee3afca5da1b4e3907f6c66d996c SHA-256: c68cf918b777f935b2b09d552548f74c642268b9fc62cd1bc8f5e33e6525e3e0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a link farm with numerous external URLs, including one pointing to 'jottigo.ru', suggesting it's designed to redirect users to potentially harmful sites. The document body's garbled content and the presence of many external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=a+day%2527s+wait+theme PDF link annotation
    • https://cdn.sqhk.co/nozelenid/L0ifwia/dixigurakesaw.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/zja7Fe0/corcraft_soap_ingredients.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/jjidypb/45516639808.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/idjchcZ/44637337772.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/hrYhieP/lelebuvibufubeweguzugo.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/2hbojjh/1103395294.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/sujorafor4flut.pdfIn PDF document text
    • https://cdn.sqhk.co/fakolafebu/bpq4Cgf/report_lost_driver_license_nsw.pdfIn PDF document text
    • http://carishr.com/83548647952k91xb.pdfIn PDF document text
    • https://cdn.sqhk.co/tajavujexiz/OnjdaGV/28781861162.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuwegijelo/fUH2ijE/domajapukagujezuw.pdfIn PDF document text
    • http://goldstein.berlin/jevamamevrt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_02c8c8c907c9412bba25d8542a2306c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/99542832781.pdfIn PDF document text
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_b6fdc46f755943b892663413ca85da8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/7140500837.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_c1c01f33b0334f93964f0f6db7d27f51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/gcmmf_ltd_annual_report.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_8b76dbc5414b4b24add8da5d334f0aa1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/collections_grade_8_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/maze_runner_free_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/maine_short_form_warranty_deed.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/rafiximefira.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/nomobobepixomiwuxor.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 5156 bytes
SHA-256: 4fd271f335d018dc4d644f486cffa50c10d8a98701c400c0e88f7801e5186958
font_01_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 11172 bytes
SHA-256: 8f9a41a3d35c4bb6a2349c92bfc529791ee03b6fb52afaf6e61fa1206f991735