Malicious PDF — malware analysis report

Static analysis result for SHA-256 16581065e3712f37…

MALICIOUS

PDF

76.9 KB Created: 2021-03-25 13:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dd5fc9816a8eeaa2575e705d58ed642 SHA-1: 24117862945e8f961338e911f45fb4647d075ee9 SHA-256: 16581065e3712f37488c00e4e67e9e25f7e4fb06a362cf280728f01d4afc6044
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous external links, including one pointing to 'midufefew.ru', suggesting an attempt to redirect users to a malicious site. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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/wix?keyword=cat+mario+online+mobile
    • https://static.s123-cdn-static.com/uploads/4413228/normal_5fcc9c68f10b1.pdf
    • http://bridgecommerce.com/why_is_my_bluetooth_mouse_not_working4esdf.pdf
    • https://cdn-cms.f-static.net/uploads/4409797/normal_60553872ad4ad.pdf
    • https://cdn-cms.f-static.net/uploads/4366010/normal_604d88622f40b.pdf
    • http://ecoservice-vlad.ru/contemporary_criminal_law_concepts_cases_and_controversiesz77qv.pdf
    • https://cdn-cms.f-static.net/uploads/4491151/normal_6041ce67f3c75.pdf
    • http://wigasubuga.22web.org/metro_2033_redux_system_requirements.pdf
    • http://habercigo.com/wooden_painting_easel_standhbbhc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/672186a3-f087-476d-8eb5-d8d7e75068b0/human_resource_management_gary_dessler_ppt_slides.pdf
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_7721896ae29640638eca96eb12ee40fa.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_7ee361249b714a9ea1f17e8f485bdcd7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e012a637-86b6-46ad-af63-3a15771589c3/54061837384.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_bbc1d23896ad40a68030aab0ed68d9a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2273d310-dcdc-4e6c-811f-37e80996ff80/gadujozavituvawajejat.pdf
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_c23a4442c226453388395f01f9e61e1c.pdf?index=true
    • http://dinedolorexos.rf.gd/29979813657.pdf
    • https://uploads.strikinglycdn.com/files/1a60604f-0d34-40b0-9e93-62dad573db63/tipos_de_investigacion_cualitativa.pdf
    • http://dagubafevipiken.epizy.com/furebol.pdf
    • http://vorupujejo.epizy.com/patukapiropejaxuza.pdf
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_d9494bc6993f43df9bcb6e56cd39c1af.pdf?index=true
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_4b90f43052774c15827d81d6079ee94b.pdf?index=true
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_da49694a114641b4acd3e9e6932e5bed.pdf?index=true
    • http://pirajog.epizy.com/pefutes.pdf
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_bf98df48fba040049394723bbd9dd704.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00e.bin
05b98c57cbf90d0581bf645874316fd6ddd230e90c7b9465ec15bf76d0cd1570		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 4604 bytes
font_01_sfnt_off0000df92.bin
1d9860d796424f6187790d8b76c3ab5b2188c0d7e50ecb45c781d3437125e68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 10264 bytes
font_02_sfnt_off000102db.bin
8b03abeb6072ef24876f51412a2822b5936c592ceae02895063af440651f4aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 16088 bytes
font_03_sfnt_off0001179f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 4324 bytes

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