Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9bb95c727a21ce…

MALICIOUS

PDF

103.7 KB Created: 2021-02-26 06:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 93e81dcec71d6a1761190fb1afdc8583 SHA-1: a934362821b4e246a454dfac006b1181dc71e2dc SHA-256: fb9bb95c727a21ce245c2d9cab59707cba49ba05cffa7ff072cc3c6bf5fadcbf
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, and a heuristic indicating it's a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://jottigo.ru/123?utm_term=civil+engineering+books+in+tamil+pdf+free+download PDF link annotation
    • http://badge-verification-center.com/firefox_67_offlinek8ena.pdfIn PDF document text
    • http://onlyforyou.space/bosch_professional_glm_40_user_manualjm0by.pdfIn PDF document text
    • http://abistrans.ru/working_with_functional_grammar7g0nz.pdfIn PDF document text
    • http://goshop32.site/my_coloring_relaxing_coloring_games_by_numbersx0b1.pdfIn PDF document text
    • http://grenkasalo4.xyz/estrategia_empresarial_librosfs29i.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/came_sliding_gate_motor_manualpez5n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_601166b237ded.pdfIn PDF document text
    • http://1offpark.xyz/531306827803firo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_6023d9b9af817.pdfIn PDF document text
    • http://rfs.team/77053375479g1n9d.pdfIn PDF document text
    • http://espaceabonnes.com/99523224164o1q4y.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/78025424746z6sj4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366029/normal_5fe3163acf9fa.pdfIn PDF document text
    • http://prodson.fun/luvenadesizuwidu8r5gg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5ff2034344acf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/purufiz/34449101536.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/wuberajovizadaw.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/email_template_size_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/uk_address_format_with_country.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012e29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E29 5624 bytes
SHA-256: 17b981ba0f219ad2bf82a3248a7c5b3622a8efddbf5d53317f69ac4e329da6b9
font_01_sfnt_off00014142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14142 12476 bytes
SHA-256: 0a8b48a016384cc440e684a3b359e8e193705b8a70d4bbb6cfdf8208ebd61338
font_02_sfnt_off00015fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB3 15916 bytes
SHA-256: 2f83571867a99f045412dc54343e86aaac465020bba2360e8c46d00ec1e1c1f6

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