Malicious PDF — malware analysis report

Static analysis result for SHA-256 addd6077f9f423ee…

MALICIOUS

PDF

76.5 KB Created: 2021-03-12 15:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d04010673144217eb31e932c54ae436c SHA-1: 333495ea9b3d5dd133493794eca1a0eb16eabaa8 SHA-256: addd6077f9f423ee63954bd2745b545c8a800e345e5894bc2141e3dd7e8965de
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://jacksth.ru/123?utm_term=balancing+oxidation+reduction+reactions+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501231/normal_5ff5e66eadbf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5feb54a23edee.pdfIn PDF document text
    • http://badgesverified.com/free_printable_coloring_sheets_pokemonmv7rt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_6041767617b88.pdfIn PDF document text
    • http://eushopvmn.site/669920929626ejrf.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/wgi4idM/4749001281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_604065256ae8f.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/aPjjdwR/44837810381.pdfIn PDF document text
    • http://apple-fruit.space/notakumusiwehm1zo.pdfIn PDF document text
    • http://alfa-quest.ru/free_download_oware_3d_apk9uzwb.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/i9orgdu/wozizadoranafisu.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/mini_golf_club_2gbo7b.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/6higfgh/vokuvoriton.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/dufekifaral/rinezibebizinodebizi.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/canopus_edius_4._5_free.pdfIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_b22ba6f54d21472b94e6b2fa83b43ebf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojenozap/rafobabijejes.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/bakedut.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/norezuvabeletosu.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/13617484924.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_f645b07a29e84a9fa0b73bdec8a3ee18.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_adc82ef7dfa9469b961c55800283963b.pdf?index=trueIn 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_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 5472 bytes
SHA-256: 7c5a35b44204d54907dd0f850ea057001bf8be7b214fabd19d47f036056df282
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10680 bytes
SHA-256: f5387c01986177ff9d0c690da1cc71de5872554481ce7f937f9c996c760434e4

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