Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85c5981b617c569…

MALICIOUS

PDF

77.3 KB Created: 2021-03-02 00:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0c57703e12221b69e9bfb5a475b6cfe9 SHA-1: d95a3bf9b5851d8dcfd7db3345837012d3a17ab7 SHA-256: a85c5981b617c569b1ca519a24d091352d7389bb2399d2e41983ca186c9ab595
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO abuse tactic. One prominent URL, 'https://dafemum.ru/strik?utm_term=navy+seal+training+length', is flagged as malicious, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=navy+seal+training+length In PDF document text
    • https://waxitajoxozaner.weebly.com/uploads/1/3/4/4/134474673/vetuza_filenesivobabi_fuluvane.pdfIn PDF document text
    • http://tixshopclub.fun/kosobovopulowalibuvob4qzvi.pdfIn PDF document text
    • http://busurman.space/gupelimoluxifovolipeg7682.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/GC7je9H/police_radio_sound_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/bCghiiL/52250609119.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/hiczjjs/last_island_of_survival_unknown_15_days_pc.pdfIn PDF document text
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/ef7afc.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/WK2I1hd/47337293877.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/3275595.pdfIn PDF document text
    • https://mopopapepiror.weebly.com/uploads/1/3/2/7/132741339/gifubozat.pdfIn PDF document text
    • https://dopesitelubi.weebly.com/uploads/1/3/5/3/135307477/kasafo_pipuf.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/vojapu/67762570765.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/4854042665.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/e._i_report_number.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/bikram_singha_bengali_movie_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/harry_potter_book_series_in_german.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/93926010770.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/attendance_sheet_format_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/what_title_does_macbeth_have_at_the_beginning_of_the_play.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_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 5080 bytes
SHA-256: 2212ab8f233af72b5000dc63940f72ac2831c00095e38b979997a45a4c76a945
font_01_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 10988 bytes
SHA-256: 9cf43433e090bdc827b9d1f9d7b95f467587e756c5f797e44afef42dd6ca3d8e

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