Malicious PDF — malware analysis report

Static analysis result for SHA-256 76673c4cce12e39e…

MALICIOUS

PDF

90.7 KB Created: 2021-02-22 21:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d65b8162efe6ebf8229d14d3578eb1d6 SHA-1: 863a7bf687acc0d4541f2664706ae7a9ac5d0b58 SHA-256: 76673c4cce12e39e91a9e8df8f62b52226b3557404363c26bd6e4c0608daf3b4
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL and numerous other suspicious URLs suggest a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to downloading a PDF, aligning with the observed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=basic+mathematics+formula+pdf+download PDF link annotation
    • http://parkji5x.xyz/entropia_informatica_wikipediauesur.pdfIn PDF document text
    • http://shop-you.xyz/kuminupigepisovonarazcy6nh.pdfIn PDF document text
    • http://wisitens.online/macromolecules_building_blocks_of_life_worksheet_answer_keyimz5w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5ff31e5ef27b8.pdfIn PDF document text
    • http://itravelimpressions.com/how_to_clean_filter_on_mitsubishi_air_conditioneritu2k.pdfIn PDF document text
    • http://getdouche.xyz/bepotokozokovinipaxesegfltw9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371543/normal_5fc8b8d3b577f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490376/normal_5fe20dd2d20a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_602c1cb086490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475382/normal_5fe52ca087862.pdfIn PDF document text
    • http://liolika-rsya.ru/65331363144obkey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://winivufada.epizy.com/aadhar_card_address_change_form_by_post.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/xusobitakar.pdfIn PDF document text
    • http://bugelinuxobeva.epizy.com/les_cercles_de_la_forme_dauphine_planning.pdfIn PDF document text
    • http://jifusewu.epizy.com/rudiwigojepemosodizi.pdfIn PDF document text
    • http://pivekukevojadu.epizy.com/75564443145.pdfIn PDF document text
    • http://dobejul.epizy.com/create_a_calendar_template_in_outlook_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/54381397788.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 6208 bytes
SHA-256: c01838034eaa455476355440bf4cd12acf1ec3ae94141dd528f8d35b54ba8def
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 5536 bytes
SHA-256: 9728bc622e8223c4f8f509fec7788e683a9f28393e6dd9b309e4643b7feb07d4
font_02_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 11876 bytes
SHA-256: 1fbeda1a0ff364b3ffceae5abf7a8bc60d0b64ad72315779bfa156a18ba2bb5c
font_03_sfnt_off0001478a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478A 16208 bytes
SHA-256: 91deeb67dd81a08e94bfe2ff4e559facad0d616951a8a20fbf16f68f5112d408

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