Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79e94c97c54f48b…

MALICIOUS

PDF

75.2 KB Created: 2021-03-23 17:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b479b1acf70676bb956d90434aa3c5ec SHA-1: 45ffcd58433a6d7bdc3d4afb1c0820558a706323 SHA-256: c79e94c97c54f48b56eb73ce26a7bce414366975cad7c32847f181b82a7564be
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary URL pointing to a suspicious domain associated with a keyword search. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to create a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=rti+amendment+act+2020+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tiduro/42518603375.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/sofakivodabarazapanep.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/vajizop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b6ab78-79d4-4d22-8599-e78f2ed52c6f/jafafatekifawelat.pdfIn PDF document text
    • https://a86b13d2-a9ad-4039-ad74-10d2f7332aba.filesusr.com/ugd/6e2451_e09690144fd6416db8dc0b310683b824.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/bipap_stellar_150_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/mematitesuxulawopozoje.pdfIn PDF document text
    • http://kolofagigetu.epizy.com/11350212192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f0755f-58a9-4217-9c00-6c71e05ce223/22905335873.pdfIn PDF document text
    • http://gesaxas.rf.gd/49056972937.pdfIn PDF document text
    • http://fasipubaweguguf.rf.gd/sat_subject_test_practice_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9862bc14-637d-42c3-b6e1-b867714e22e4/83339174922.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_b881b4485b7249f98b7f52a704cee97f.pdf?index=trueIn PDF document text
    • http://duvufewitopemaw.rf.gd/vuvijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d2cbe2-b1c8-4e92-add3-aa95f6391d14/33332716128.pdfIn PDF document text
    • http://powajokex.rf.gd/resoni.pdfIn PDF document text
    • http://daferavore.epizy.com/16778095727.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/fedex_express_freight_us_airbill_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/nene_ambani_movie_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/vibifa.pdfIn PDF document text
    • http://pujusojup.epizy.com/new_headway_intermediate_teacher_s_book_answers.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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 5276 bytes
SHA-256: ad1a1ae648daeedef6243b086cabb0e132d5d26bfeb1d9775a15a609fc5497dd
font_01_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 10732 bytes
SHA-256: aa020c46fbef148fad5702def13a9e7e4374a207be33216d399f2ec51cbd5b5b

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