Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b191423b89c4db…

MALICIOUS

PDF

85.6 KB Created: 2021-06-07 21:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c01488882239251f812d3626c4d6cd23 SHA-1: 0b28e97e257ee7ff16a0d8ecb1152d51903f22e5 SHA-256: 05b191423b89c4db448c804f74fe5a210614025126e156d727215f71e705ec16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, flagged by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is garglob.ru, which is likely part of a link farm or phishing campaign. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or SEO spam attack.

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://garglob.ru/pbw?utm_term=par+quoi+remplacer+la+fleur+d%2527oranger+dans+une+brioche PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382421/normal_605d41704b09c.pdfIn PDF document text
    • https://puzemebakojufem.weebly.com/uploads/1/3/4/2/134234574/gukugusu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fcf04b114284.pdfIn PDF document text
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/76d340c3402.pdfIn PDF document text
    • https://gikapatom.weebly.com/uploads/1/3/4/0/134042778/2185f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_602736faa680f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_6059c4a066803.pdfIn PDF document text
    • https://pupuwovojetisig.weebly.com/uploads/1/3/1/4/131438468/puterinet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_602c3fa28335b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be563de-6d71-4ae4-91f9-571bb44ce3b6/57452903888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce90974-56e6-4f9a-8c3a-8f766431b08d/24_hours_in_nowhere_book_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df06c89-27b9-4c01-8163-8a4444b78532/how_much_is_a_high_blood_pressure_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a5d132-7bd3-485c-a06d-ab9663c7fa96/xajosagozobekugal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21275f54-dde3-4d48-aa67-f71746dafcd8/how_to_use_a_slow_cooker_for_rice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7faeab-1e09-4f2b-a5f9-9e0d1e9b5cd1/best_free_drawing_app_for_ipad_pro_with_apple_pencil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b115920-14d9-4fa3-8202-bd46fe4bb0f2/temperature_scales_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b854981-e2ed-41e9-be00-a72cbb5b583b/w_j_ong_orality_and_literacy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3426a73-d5b6-4c94-96eb-391ef3c32a47/what_are_the_10_naeyc_accreditation_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51b27db-2276-468a-adc7-a54279054ef6/40205223491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d79793a-7301-476d-bbbc-76ca7b885e14/genetics_comparing_mitosis_and_meiosis_the_biology_coloring_book_answer_key.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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 5872 bytes
SHA-256: 0f1dc80a98a49ade5b4cad25d8a9b5bd122a469b81c6ebbe0a6661c0af933bd4
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 12628 bytes
SHA-256: b99d74cdd795c5dee86377717e167b9b04edcc481abd368dc85b9de8c0c3213e
font_03_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 16416 bytes
SHA-256: ad57849bc9293ae1c91dfeae0d16579dfa2b1e827a438f090cc3704be039eaae