Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1904608a187096…

MALICIOUS

PDF

89.9 KB Created: 2021-06-06 20:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 648b9919c3e496011d8486c567d39df6 SHA-1: c7e89183427b408a65724d14d6a204c4376d9724 SHA-256: 9a1904608a187096803d82354f6d224c760132bb184fe1d84f443fd8da7de707
126 Risk Score

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, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of the 'utm_term' parameter in one of the URLs further supports the idea of a targeted lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://krisoc.ru/pbw?utm_term=xforce+keygen+autocad+2013+32+bit+free+download+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405899/normal_606d156a3b745.pdfIn PDF document text
    • https://dezilupogebog.weebly.com/uploads/1/3/4/1/134109094/8144791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393359/normal_5ff84a3e7cd27.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/a9d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471948/normal_6019d78ee99fb.pdfIn PDF document text
    • https://jasadugo.weebly.com/uploads/1/3/5/3/135341750/bd79afde309a89.pdfIn PDF document text
    • https://vozupixog.weebly.com/uploads/1/3/4/3/134312338/rejigegavamu_litowok_joguwaz_dokasusugegafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_600fe9f9a7e05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_604d7b5d825c2.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/1029871.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/488056.pdfIn PDF document text
    • https://timowerudep.weebly.com/uploads/1/3/0/7/130738780/1556205.pdfIn PDF document text
    • https://satufikobupi.weebly.com/uploads/1/3/2/6/132695363/6db9b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaporezikumu.pbworks.com/w/file/fetch/144586299/how_to_memorize_tarot_card_meanings.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144425091/39002861084.pdfIn PDF document text
    • http://davixezudi.pbworks.com/w/file/fetch/144645810/vuwuvexobadotofutojovikal.pdfIn PDF document text
    • http://pexovobef.pbworks.com/w/file/fetch/144673230/mini_cooper_warranty_south_africa.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/53779867586.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144469791/transformers_2007_movie_download_filmyzilla.pdfIn PDF document text
    • http://pitavumiza.pbworks.com/w/file/fetch/144623145/what_is_the_best_bedwars_server.pdfIn PDF document text
    • http://nikekuva.pbworks.com/w/file/fetch/144414246/slayer_leecher_v0_5.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144485562/nubaxejudutagegub.pdfIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144553752/xoxupusogarel.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144669492/writing_balancing_and_classifying_chemical_reactions_worksheet_answer_key.pdfIn PDF document text
    • http://bowawesup.pbworks.com/w/file/fetch/144639696/29824449143.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144731910/33598694771.pdfIn PDF document text
    • http://degenazi.pbworks.com/w/file/fetch/144433830/what_is_the_latest_samsung_tab_update.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 6056 bytes
SHA-256: 87f27512589989fbe93a4afb2d6f0a429350446660dd3ddb4dea598d71b9f0e7
font_01_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 11660 bytes
SHA-256: 73cdd2bf46c9666e6b1eaef31ccf55542163d97b1bc07329d8e49b9f5c238184
font_02_sfnt_off000140e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E7 16920 bytes
SHA-256: 99d50c4195ec1034dac579fedded64b8fc455db7f77d98627fad31e9cc07a68b

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