Malicious PDF — malware analysis report

Static analysis result for SHA-256 478c4aeb636fa1f4…

MALICIOUS

PDF

81.5 KB Created: 2021-04-01 04:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c2c543be9041bee3f7200115792f814 SHA-1: 2cd946a256994f1c4a4ed64c985d54cbb09b3f3e SHA-256: 478c4aeb636fa1f4cd8f9678a04b3d781c23850ba36e4095526ceb84aa5b2ab5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or SEO spamming campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the presence of numerous external URLs points to a malicious redirection or download scheme.

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://dafemum.ru/wix?keyword=directions+from+orlando+florida+to+tampa+bay+florida
    • https://cdn.sqhk.co/valujoper/j2hdghz/shark_ion_robot_r85.pdf
    • https://cdn.sqhk.co/jevamivuvugi/ib8jjhf/ps_we_love_you_rewards.pdf
    • https://cdn.sqhk.co/relulapezele/jbjevhd/adobe_photoshop_sketch_for_windows.pdf
    • http://sallehq.xyz/vezajadigedusol.pdf
    • https://cdn.sqhk.co/rabawula/hdGhdgf/easy_diy_wedding_checklist.pdf
    • http://filmera.ru/15061256469rae3y.pdf
    • http://reduslimitaly-official.website/block_bold_font_freedp35b.pdf
    • https://cdn.sqhk.co/sofizagumup/Ahiijgg/37037491534.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_d0d16687102d4d31a0d44561d806f9a7.pdf?index=true
    • https://s3.amazonaws.com/purixifusipelid/74635350395.pdf
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_c8f10c73ee7b4f4c88943eab65a7c657.pdf?index=true
    • https://7054f9d6-44ea-4b6c-8535-0d04e7cb9957.filesusr.com/ugd/963b03_ac06dbd1ca074adbb7b8cf2ee626aad5.pdf?index=true
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_a4be510d9b4045b294966665236e53e6.pdf?index=true
    • https://s3.amazonaws.com/vikukinumet/xelodil.pdf
    • https://2b075577-062e-477b-ba44-a680027dca12.filesusr.com/ugd/ee943f_a1dbaad8646a4e0685683e78c640a5ca.pdf?index=true
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_3cfd01b96ce8413f850f3054cd89ac95.pdf?index=true
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_6f9e88b3ae2145a4a1cfb765e791b227.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_6672955a3c904d6781e1111dcd0f2a90.pdf?index=true
    • https://a4078cf6-8fa3-420b-ab61-258487076e43.filesusr.com/ugd/a3907e_eaeea6ebad834e5e835cb455faa94dee.pdf?index=true
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_ea97c15bbd2f4681849caec34dd5f54a.pdf?index=true
    • 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_off0000fda5.bin
7cf7d1a3521d83243e83705dc98229b89946b4ec12d1ba493c875bd1ca83f971		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 5540 bytes
font_01_sfnt_off0001106a.bin
ed2a48cb487c397ba070be1050e1df0c28277106d248564bc2eefd4cdfce0cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 11684 bytes

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