Malicious PDF — malware analysis report

Static analysis result for SHA-256 19df49d13a589993…

MALICIOUS

PDF

75.8 KB Created: 2021-03-29 22:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5a547c4d6a0d06011ac0ed13ee718c47 SHA-1: d3b6dca2f386e7d78a92729f94dc4038f6533e33 SHA-256: 19df49d13a5899934fcf02b8d7d4540eb5c014a2d7dd93a4ca70679f2d1d6866
126 Risk Score

Malware Insights

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

The file is a PDF containing obfuscated content and multiple external URIs, flagged by ML classifiers and ClamAV as malicious. The primary malicious indicator is the PDF_URI heuristic pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/award?keyword=adjectives+and+complements+pdf PDF link annotation
    • http://wisecredit.info/86039561677hrlff.pdfIn PDF document text
    • http://accueilcmb.com/biwazaratai7voe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5fef925a8099f.pdfIn PDF document text
    • http://top-shop-store.website/676489403661azlp.pdfIn PDF document text
    • http://tekplafond.xyz/pilularetdqqfj.pdfIn PDF document text
    • http://gradstroy.su/vowokidaxufq3lrm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_603b0aa62caa1.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/fWPwfjg/orcs_civil_war.pdfIn PDF document text
    • https://cdn.sqhk.co/sirigibi/jfnIU3F/langrisser_i_ii_switch_gameplay.pdfIn PDF document text
    • http://websporizle4.com/damian_marley_full_albumd1ma3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_605923c81fa06.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/jjdidha/cliente_plex_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_600bf65ca6678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403936/normal_5ff8526c39c18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekezaru/the_amount_of_snowfall_falling_in_a_certain_mountain_range_is_normally_distributed_with_a_mean_of_94.pdfIn PDF document text
    • http://wipupafe.rf.gd/acalasia_chagasica.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/61737157837.pdfIn PDF document text
    • http://vajevus.rf.gd/matrix_math_rules.pdfIn PDF document text
    • http://gofuvosopo.epizy.com/free_game_assets_unreal_engine_4.pdfIn PDF document text
    • http://favigagiwu.epizy.com/folder_from_s3_bucket_using_python.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/423188241.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_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 5332 bytes
SHA-256: 59583496f208b89027f936a916f70c60056121d038b3d187b983d1811825ecc3
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 10948 bytes
SHA-256: 59ecbefbcd540aa6d17afeb48e6cec8848f866ebc3b565277302ff8f9efa05df

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