Malicious PDF — malware analysis report

Static analysis result for SHA-256 306ede5981657e55…

MALICIOUS

PDF

80.1 KB Created: 2021-03-20 00:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42f138a2a91246841e607496ea01393d SHA-1: a982a19be8672ae2dbbec3ee7c1108af90dfc402 SHA-256: 306ede5981657e55840f525a1cd4c03b622f86e9d01e47ee110638a01228f718
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, including one identified as a potential link farm. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to trick users into downloading harmful content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites or initiate downloads.

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://druttle.ru/wix?keyword=tango+mod+apk+free+download
    • http://excellent-spb.ru/11397384899a81q.pdf
    • http://tryraisins.club/hamilton_beach_breakfast_sandwich_maker_instructionsdgol7.pdf
    • http://rezexepenoma.scienceontheweb.net/ziwijusijofagetavaz.pdf
    • https://wuwenesugujiku.weebly.com/uploads/1/3/0/7/130739695/2490188.pdf
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/55c7a2680.pdf
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/birapiluwixiru.pdf
    • https://giloxegikejuzun.weebly.com/uploads/1/3/4/7/134712531/vagitebadifo.pdf
    • https://motodamoz.weebly.com/uploads/1/3/1/4/131452818/zakebegobub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_adbea9be0d164071ac62edcaf3f0e9c8.pdf?index=true
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_4bbe160d7a1c4f14b587363682e38595.pdf?index=true
    • http://suvalomimo.atwebpages.com/pirates_of_the_caribbean_medley_piano_sheet_music.pdf
    • http://bumurulepowele.myartsonline.com/curso_bobinado_de_motores_electricos.pdf
    • https://s3.amazonaws.com/dowavelaxam/anti_ragging_act_ppt.pdf
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_8ef4f108785b40ccbd85a3719f3e5978.pdf?index=true
    • https://s3.amazonaws.com/voxulija/11323060887.pdf
    • https://s3.amazonaws.com/jofunozuzof/13806634596.pdf
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_b185e0538ccc4cc59e20a8c4e99c1ffd.pdf?index=true
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_bf38006f1c9245888721c772ee610503.pdf?index=true
    • https://s3.amazonaws.com/fizaxo/bose_tws_k2_review.pdf
    • http://nejesezape.myartsonline.com/how_to_write_grants_for_nonprofit_organizations.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef58.bin
07637ef2e9d2ec5d52c315a583372fad49ef12ba1e1f974c62ec29acf2a9fcb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 4948 bytes
font_01_sfnt_off00010023.bin
718488901e9f0f08153184cc652ea31f9524b6f479860e100d801de80b55ba3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 10856 bytes
font_02_sfnt_off0001255d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 4324 bytes

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