Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd420cb20682d602…

MALICIOUS

PDF

75.4 KB Created: 2021-05-27 01:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b274e1497fc4ebf8cd5553d03fd748d SHA-1: 95425f55f695fb5c47c41f4ac7388198e4c60ef6 SHA-256: fd420cb20682d6023739971c3765fb685b8385ec441d0d44e67943b98cbdb2cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a search query. This suggests a phishing or malware distribution attempt, leveraging a seemingly relevant search result to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://maypoin.ru/wb?keyword=older%20kenmore%20ice%20maker%20not%20working
    • https://cdn-cms.f-static.net/uploads/4374022/normal_601db654e5393.pdf
    • https://cdn-cms.f-static.net/uploads/4462376/normal_606da0d529d6e.pdf
    • https://cdn-cms.f-static.net/uploads/4470696/normal_60221d405e354.pdf
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/1388407.pdf
    • https://bebiluredop.weebly.com/uploads/1/3/3/9/133987060/2801920.pdf
    • https://static.s123-cdn-static.com/uploads/4453144/normal_5fe1587d51620.pdf
    • https://static.s123-cdn-static.com/uploads/4467036/normal_5fe4b810bd851.pdf
    • https://vakipubar.weebly.com/uploads/1/3/7/5/137507767/xinajed_jovazafa.pdf
    • https://static.s123-cdn-static.com/uploads/4482403/normal_5fc94186d78ff.pdf
    • https://static.s123-cdn-static.com/uploads/4365584/normal_5febd7de2326d.pdf
    • https://cdn-cms.f-static.net/uploads/4453563/normal_600b117a7a360.pdf
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5fc6a6630f812.pdf
    • https://cdn-cms.f-static.net/uploads/4481671/normal_601838f655c67.pdf
    • https://xeravatiwawu.weebly.com/uploads/1/3/4/6/134603636/3947539.pdf
    • https://cdn-cms.f-static.net/uploads/4451756/normal_605d833b0cdda.pdf
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/2493535.pdf
    • https://cdn-cms.f-static.net/uploads/4385620/normal_6058bd2433f32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6edffaa6-17d4-468c-a5f6-a788a1ebff26/qu_es_la_metformina_de_850_y_para_qu_sirve.pdf
    • https://uploads.strikinglycdn.com/files/24cc42d5-a0fb-4bf5-a926-0871e6378f87/which_animals_can_hear_the_inhighest_and_ii_lowest_frequency_sounds.pdf
    • https://uploads.strikinglycdn.com/files/bde241c1-b170-4398-bb6b-a735f1f7eff0/mi_lbum_preescolar_segundo_grado_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f5.bin
1c47cbe6441848dcd091c5e3309d9c94c50222a075864495b3432183add78934		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 5264 bytes
font_01_sfnt_off0000f9d8.bin
1addba41ff8781d7b5b78e0f9631f0117962af8748b90ce88c576045e99c5e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 11628 bytes

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