Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cd4e8e73c26f8f…

MALICIOUS

PDF

67.4 KB Created: 2021-03-20 22:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05d6ed30ba918690c09f86f1c4ed509 SHA-1: dd89c4a6c9d866a00db115528c25d37b923c0bbc SHA-256: 37cd4e8e73c26f8f565c2453c7f4c41d71284defd63042fb0aa22d5146fd8fd3
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'link farm' heuristic point towards a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=note+taking+worksheet+sound+and+light
    • http://lnstagram-copyright-supports.com/robert_frank_the_americansw0l0e.pdf
    • https://rarozevalir.weebly.com/uploads/1/3/1/4/131437937/062c665c40e36.pdf
    • https://pejejuwefosewa.weebly.com/uploads/1/3/4/0/134040570/5863574.pdf
    • https://katebobuwusa.weebly.com/uploads/1/3/1/3/131384636/xidinujuv-bekupuzox-musuvidamobe.pdf
    • https://cdn.sqhk.co/nimuxugemu/chewUjg/tuludujipifadekebororez.pdf
    • http://afterdealer.pro/53823763041zeqxb.pdf
    • http://mnclassis.org/57574817819wn278.pdf
    • https://xalorato.weebly.com/uploads/1/3/4/3/134317389/2451793.pdf
    • https://xipumizi.weebly.com/uploads/1/3/4/7/134746986/7184415.pdf
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/720520.pdf
    • http://tejidirexe.mywebcommunity.org/porter_cable_pcc792la_20v_max_16-gauge_finish_nailer_kit.pdf
    • https://cdn.sqhk.co/xetilibul/Vhj1hdJ/davokonukixemodi.pdf
    • http://antinomi.design/12503437001gsalw.pdf
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/poxuvaxipimujidiros.pdf
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/1050188.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jaxunukologefis.onlinewebshop.net/adventures_of_huckleberry_finn_quotes.pdf
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_3480c2c9466f4907b694f4b2ab88978c.pdf?index=true
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_aa88ac109fd645e4b0043cfa2b69b5a7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb0.bin
a99dd432689338d798db6724a9a07ab87abe9d9c314312776e50764f348758f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 5212 bytes
font_01_sfnt_off0000df79.bin
74d52fcfaa5237586fb9a733d51cec9b6481e98747db49e1fa79acff4a41fa2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 9700 bytes

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