Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb0a43415f66612…

MALICIOUS

PDF

68.3 KB Created: 2020-11-14 20:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf4d659461719c27d86df026513574f7 SHA-1: 143246524fb1307209c171c6cb2725b8e7b7a6e7 SHA-256: 4bb0a43415f66612f49e68ae48e104e893885a40e4a4665aec561f7e87b17551
214 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the heuristic firings and the malicious URL are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=%25C3%25BCbungen+active+passive+englisch+pdf
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/9f3901.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/53f74bfc-c26b-4984-a0fd-a3facb6619f1/tazusabo.pdf
    • https://uploads.strikinglycdn.com/files/72156c15-3d25-4d13-8852-f6af0fc64a21/gecenin_sonuna_yolculuk_zet.pdf
    • https://uploads.strikinglycdn.com/files/0f5a1b3e-e762-42fd-b966-398162b6f40c/magnus_chase_book_2.pdf
    • https://s3.amazonaws.com/tetazino/22028738540.pdf
    • https://uploads.strikinglycdn.com/files/ad1cc12f-815b-4e71-aa19-9e861dedc5a5/telf_joolam_wow.pdf
    • https://uploads.strikinglycdn.com/files/5945cf94-ab2f-4142-b35a-28ff241adb6b/28714137354.pdf
    • https://uploads.strikinglycdn.com/files/d41f1a7b-d247-4869-aacd-1f0b3c3557ec/zikod.pdf
    • https://uploads.strikinglycdn.com/files/87f9ab84-7a87-4117-8b9f-ab59b0baf7fc/76357605893.pdf
    • https://uploads.strikinglycdn.com/files/037f0aa2-ec84-44a4-824f-a8e59ac98f15/muscle_and_a_shovel_summary.pdf
    • https://uploads.strikinglycdn.com/files/9602f7c9-9355-4d12-9bea-15247b96b2eb/davawuvopasaj.pdf
    • https://uploads.strikinglycdn.com/files/75e9b117-6797-43f9-9d8c-575d486f316d/the_world_s_easiest_game_ever_cat.pdf
    • https://s3.amazonaws.com/jadudusujuje/98216664173.pdf
    • https://uploads.strikinglycdn.com/files/efb34cf7-3756-45e3-b614-8145052c4231/sudodo.pdf
    • https://uploads.strikinglycdn.com/files/83278e9c-56d8-4b61-a1cc-c4834ea2a140/cambridge_ingilizce_okuma_kitaplar.pdf
    • https://uploads.strikinglycdn.com/files/cf245b0b-a241-4fa3-b5a4-25bd398dd82f/pujexebin.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_off0000ca8c.bin
f08100d76a14b9bae96e75e817968dc00d202d81f17e2c5166cc8f1da7612183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 5536 bytes
font_01_sfnt_off0000dd6f.bin
47c8d611b2e1ed1e8f829f39fd8423bf96f75abc43de7d7c84972f6b5bbee122		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 11052 bytes

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