Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bf0214c6013cbd…

MALICIOUS

PDF

73.3 KB Created: 2021-04-01 05:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e2fb7939b4141cd6a072e962495c93f9 SHA-1: 20fba8abfabe3dc50bb0bb185f45a53b69cc4039 SHA-256: f5bf0214c6013cbd1cbb0f90f9758ec839c295817e22220d10aac84bb2135302
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded URL and the document body text, which mentions "virtual momentum lab answer key", are used as lures to direct users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/wix?keyword=virtual+momentum+lab+answer+key PDF link annotation
    • http://prizinsta24.online/wixumop73mv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_6004a353aabbc.pdfIn PDF document text
    • http://wavolat.iblogger.org/2d_affine_transformation_matrix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_603453604bc2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473445/normal_60264ad18140e.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/kefifeg0p7ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_604f8cdc7451a.pdfIn PDF document text
    • http://www19216801.site/lorefuponofeme0n002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimitafukufes.rf.gd/clipping_words_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f0d992-99f2-43e9-9837-d505f0fae3f6/snow_whitening_kit_byte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e83f41-1c1a-4a64-81a0-32f84b4a7a5f/flir_c2_thermal_camera_with_mr40_moisture_pen.pdfIn PDF document text
    • http://gojetovumivet.epizy.com/sony_camera_4k_apk.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_d5b1e7b2b47e4c4991de263e01055dd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2059713-95af-439f-ab45-f930aa091d52/muxerusekusinufebubifenid.pdfIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_6d12ce1878ca443c8e52877fbc78b1fb.pdf?index=trueIn PDF document text
    • http://vopawolug.epizy.com/94198164304.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_924170bee3c04a9e86ebb22acd379569.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1beb24-0fc8-46fb-9316-ce945bf839b9/rerejudutif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83815fc9-06a9-42e6-a9c3-7bedd12b5065/kung_fu_panda_2_watch_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55602625-7c67-4efb-be66-feca11491013/fujesanereparape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3309aa4d-e9f7-4c94-a704-82e737b42069/oster_18-quart_turkey_roaster_oven_24-pound_red.pdfIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_44cc8db2f3284d108115375f676fceb9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/011f8044-d277-4fc4-8e8b-0f4fa5be32ce/what_is_a_hallmark_hall_of_fame_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4ebd66-7289-430c-be5a-79eb82337c3a/kegatejatuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44eff331-6cdb-4cec-b532-00caaeb739b8/44515479991.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 5192 bytes
SHA-256: a0efe8051b0fc8b4f55a91b4c92528b7334a0163a0195c600dae42735f1f4387
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 10812 bytes
SHA-256: 04b1b5f5405f5167b89aa6701d023ec30a82959b0ca1dbef29673e18ded6880a