Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d2b3d4132234d0…

MALICIOUS

PDF

93.2 KB Created: 2021-04-26 10:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 061ca81cf380e88fccd575912494fcd2 SHA-1: c9118b9b254057eaf5e9e521bf1bb9c785490b8c SHA-256: 31d2b3d4132234d0a4addb4ea6b13bf87206dfd7797bb1f72a47b87c5dbea3cf
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as phishing. The document body, though heavily obfuscated, mentions 'Behringer xenyx x1222usb usb mixer with effects manual', which is likely a lure to attract users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dugedepap.ru/strik?utm_term=behringer+xenyx+x1222usb+usb+mixer+with+effects+manual
    • https://static.s123-cdn-static.com/uploads/4490950/normal_5fdf923b042cc.pdf
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/tefexot_xapadekenoj.pdf
    • https://nakoginav.weebly.com/uploads/1/3/0/7/130776809/3f203a0ba13.pdf
    • http://simcars.ru/sonixowm6aw4.pdf
    • http://antonioita.fun/how_to_tell_if_someone_is_isfj_or_infj5wtqw.pdf
    • https://cdn-cms.f-static.net/uploads/4389366/normal_6038215e3c8f0.pdf
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fdb00fcf34ad.pdf
    • https://cdn-cms.f-static.net/uploads/4471706/normal_60543a2f729bc.pdf
    • http://reweder.site/data_warehousing_jobs_in_singapore2ey7e.pdf
    • http://formblckr1.xyz/2019_ashrae_handbook_hvac_applicationik2a.pdf
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/fetadiwewud_kozas_tirono_vozetawajetilo.pdf
    • https://tewijudejasivi.weebly.com/uploads/1/3/2/6/132682467/81a6e440099af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_b420745fe7b4484597f1c419d08b4435.pdf?index=true
    • https://uploads.strikinglycdn.com/files/edbd5c0c-40bc-49f6-a487-6df5f39b1418/washington_post_games_page.pdf
    • https://s3.amazonaws.com/lumixi/10600458765.pdf
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_d0a2501a2f75471480e9c1d73efc55ee.pdf?index=true
    • https://s3.amazonaws.com/nigimul/bejefubesovesokeni.pdf
    • https://s3.amazonaws.com/muvemasoxaji/37794382498.pdf
    • https://s3.amazonaws.com/pogolo/rulaje.pdf
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_92af6516807d4e2e8b35d9feccecfa6b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/055332fb-e6ee-45c3-8100-4df964112751/for_beginners_how_to_draw_girl_anime_manga_face.pdf
    • https://s3.amazonaws.com/rozebofukixus/al_ansari_exchange_app_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ec8.bin
b91ecfe5fa3fe7051840303f00f726ff6d63080c98871ad36f2cd05830100312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 5700 bytes
font_01_sfnt_off00013228.bin
a03cf125032fc19906402119f7b7275a49a49b247af31b65c8622f2c3c7601ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 11384 bytes
font_02_sfnt_off00015857.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15857 4324 bytes

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