Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab90b5d73df197c…

MALICIOUS

PDF

93.3 KB Created: 2021-03-23 04:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d785b193660b6f52fc1668384960d6cd SHA-1: 7ed498d9ae62edb9a546a50d872d57088cd036fb SHA-256: dab90b5d73df197cbe8fe985dccd66f5c3ce74d6de3be025ff9fabbd664f5e41
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting it functions as a link farm for SEO manipulation or to distribute further malware. The primary external URI observed is https://xezojetit.ru/strik, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=the+lost+book+of+thomas+youtube
    • https://cdn.sqhk.co/kenoramof/hhbidWk/aimsun_8._2_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4480579/normal_5fe6ba75cdc68.pdf
    • https://cdn.sqhk.co/lanabeja/RFYNvvh/cardi_b_songs_2020_list.pdf
    • https://cdn.sqhk.co/zotofoza/mhehiFS/nbc_connecticut_ct_live.pdf
    • https://cdn.sqhk.co/zifuvifiweva/akEWzdf/82932569840.pdf
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5fd3cb0809085.pdf
    • https://cdn-cms.f-static.net/uploads/4455380/normal_605913ad3c969.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pidufozu/log_log_graph_sheet.pdf
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_7674c44008b64376bdac5705b9bc007a.pdf?index=true
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_1b7596d9edcc4222a261c13a72698312.pdf?index=true
    • http://galukovo.epizy.com/lelebogosufirufilulej.pdf
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_ff4f57532c54422cb670092f25338d9c.pdf?index=true
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_d643749d2cbe40249f2ce038ae286500.pdf?index=true
    • https://s3.amazonaws.com/wazorixekunafob/2716849538.pdf
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_cf8a66b6d28a4c25a992939f8cfd05a9.pdf?index=true
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_549f377560a841b1bba733ac77147be4.pdf?index=true
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_d7c7c21de95e402f807f96921c5a19e4.pdf?index=true
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_60a97c5dc821486f8d6a14dc822a58bb.pdf?index=true
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_ab2c1365e0ab47859cbe730f846c5d22.pdf?index=true
    • https://s3.amazonaws.com/gavexilatuvitaz/wandering_earth_english_dub.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_off000130cc.bin
0e1e04028aee379c072e7889bd562027720b33d3c850bdf3356a330ae9dd6243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130CC 5164 bytes
font_01_sfnt_off00014241.bin
3ad4d73c6abe5a6ec321edcbcac7960c6f56bd8daaeca154e5027bc77968c030		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14241 11096 bytes

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