Malicious PDF — malware analysis report

Static analysis result for SHA-256 b288d7e2a45d4be3…

MALICIOUS

PDF

84.9 KB Created: 2021-03-14 13:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ce77c4e7e9db54b9a98742d6b8e2b59 SHA-1: 56b4cddcbf2bf17aaeae4fa7de7647957d44489f SHA-256: b288d7e2a45d4be3667e548f745013cd718d98ec4dd4ee008b8c6afeacd00b90
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=ahle+hadees+islamic+books+urdu+pdf
    • http://zumikavu.22web.org/runecrafting_guide_osrs_f2p.pdf
    • http://gefaveje.22web.org/bomakasigegofegubejafiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuletivotarupu/gukabupix.pdf
    • http://jigikox.rf.gd/call_of_duty_1_apk_free.pdf
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_d7e3835325d24c09b96865891121ded2.pdf?index=true
    • https://s3.amazonaws.com/risalenefazozo/55760140300.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_fad33b9a2a5246779aaafc9b4fdc35e2.pdf?index=true
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_34cbbc7ed65c46d8a525930f41e23049.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_e01df2012def4e26b4ebf88dd71b75d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea3a7d0e-4e78-491c-874a-c6492943dae8/idylis_freezer_reset_button.pdf
    • http://borovob.epizy.com/nagasivetilipux.pdf
    • http://zefuxaninegug.epizy.com/susukedifak.pdf
    • https://s3.amazonaws.com/wozowuledij/american_button_maker_template.pdf
    • https://uploads.strikinglycdn.com/files/dfa25b3a-6159-46de-842e-4bc5d92e769d/punazunididupesituledujo.pdf
    • https://s3.amazonaws.com/zarusegibitumet/rokukoso.pdf
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_85c6399abea446608621c157808394b5.pdf?index=true
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_041474b66698475e9ccb5129028fe5d9.pdf?index=true
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_1c91d813699848af85827fe6598f0d16.pdf?index=true
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_9caf784029cc49af88bc868b52489640.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bc1e4b04-b70c-48ce-89ef-fe5ef18b1b1b/36542484824.pdf
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_e3faeeffd40940f2a4cbc7110e4d578c.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48a.bin
3e88e35518d5aa8442e34e3233c6c478379355bb85ce0a0136b0b7c44cd5571a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 5588 bytes
font_01_sfnt_off0001075e.bin
747c7d680fa85b959d878a606aa03ba25b35d2b989406825ead3ff45b14c83d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 11380 bytes
font_02_sfnt_off00012e5c.bin
5c971579a9757ec78140e64ead599d54fdf12b60b3cf2ea948461a3b0714b55c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5C 16364 bytes

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