Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f04ef82531f242…

MALICIOUS

PDF

83.4 KB Created: 2021-03-17 14:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e32cbc3ffc651794eebfaa2744537d1b SHA-1: 792e8b6e2f0c2d69f2d8a57eebe83bfe128cbf2a SHA-256: a2f04ef82531f242ad66cb6a16f7d3cbf8e25612332a82ac3cd36869b352e123
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely intended to direct users to malicious websites. The presence of embedded URLs further supports this, indicating an attempt to redirect the user, potentially for credential harvesting or malware delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=brightcove++video+api
    • https://cdn.sqhk.co/wofikubid/jahiMgf/1492687007.pdf
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/memopi-fevikig.pdf
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/gututudimofofuk_lafoxodeluwen_dokerudol_xokamajixu.pdf
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/mowaxerikupu-tiduwuzidik.pdf
    • https://kalozepi.weebly.com/uploads/1/3/0/8/130814360/c3c200a.pdf
    • https://cdn.sqhk.co/fiporalisu/kPKQTJW/sowujapedifokif.pdf
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/vukixasurumusobevu.pdf
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/xawufir.pdf
    • https://cdn.sqhk.co/fejukomus/hijfIgj/36103033755.pdf
    • https://xolipesu.weebly.com/uploads/1/3/4/6/134672505/bamujogiwid_zefesusimefiz_pazemoxoj.pdf
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/mujeferebom.pdf
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/wujirazezikuka.pdf
    • https://cdn.sqhk.co/sepetoxofaw/djaBgiT/use_murder_in_a_simple_sentences.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_5693fff31b59485eaeaa4d442f8ab15b.pdf?index=true
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_63810986581b445a91b1a34bb969fc0f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b406b4a6-fcb6-4a99-9246-ad4e00c03c75/gudezezukatobufewe.pdf
    • https://uploads.strikinglycdn.com/files/89354d06-4302-4200-a3ca-3ccb81e61347/vonogajirenelexebidos.pdf
    • https://uploads.strikinglycdn.com/files/ad6ac246-2f5a-4a95-8e1b-010c576654e2/denon_avr-s510bt_owners_manual.pdf
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_71c7f0172fce4a8aac2aee1ead6b9ea9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/faca40bc-aefe-4181-9e3c-5eb3d1933703/program_genie_excelerator_keypad.pdf
    • https://uploads.strikinglycdn.com/files/144c6b23-ad7b-418f-9b8c-f2de01080cd2/how_to_spot_a_fake_baofeng_uv-5r.pdf
    • https://uploads.strikinglycdn.com/files/c6138799-02c6-402d-8bd7-39605000c003/how_to_contact_sentry_safe.pdf
    • https://uploads.strikinglycdn.com/files/4da7212f-d212-4ef9-aa8f-21c96577cfa0/josujidalajumimiwogawil.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_off00010a0a.bin
25d00010de87cb2ad2de505029bca132a7855a50ba7403b4251e306b84d826a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 5236 bytes
font_01_sfnt_off00011bdf.bin
d9b8810d2fe707c9e0fa0d27d46cdf6fadd5fed9a530e060cc3b634b5719617e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 10784 bytes

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