Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b315299606e420…

MALICIOUS

PDF

83.3 KB Created: 2021-03-28 14:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d024f4e8e28a85d73c1fdbbdc10f7ea SHA-1: 7b752a8081c2fb976b0f5d3bcffc0568b7b3a5e9 SHA-256: e4b315299606e42063fa321cf81073a5a3978baaaaf9079f37eceee0817d9fbc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains a link farm with numerous external URLs, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=dls+18+coin+hack+android
    • https://cdn-cms.f-static.net/uploads/4393503/normal_602c3ee3bc330.pdf
    • https://cdn.sqhk.co/fogibadeku/R5thcvG/raluwezasoloxipabo.pdf
    • https://nituzizuzij.weebly.com/uploads/1/3/6/0/136091047/10f7f1e7.pdf
    • https://golewobewawir.weebly.com/uploads/1/3/4/3/134350879/fa1fcfc27f.pdf
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/9821792.pdf
    • https://pupogonixim.weebly.com/uploads/1/3/4/3/134318621/wemedejejul-pofozixal-notobebizomot.pdf
    • http://panedapupugaxe.22web.org/christian_songs_tamil_video.pdf
    • https://cdn-cms.f-static.net/uploads/4465545/normal_603e5edb3271e.pdf
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5fd3d0f8165ad.pdf
    • https://cdn-cms.f-static.net/uploads/4489587/normal_6028999e58659.pdf
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/0fbbf63727b856.pdf
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/9278051.pdf
    • https://cdn.sqhk.co/bebumula/hjLbifz/cross_stitch_coloring_app.pdf
    • https://cdn-cms.f-static.net/uploads/4460706/normal_600e06e0204c8.pdf
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5ff08e5925f35.pdf
    • https://xovokemopozok.weebly.com/uploads/1/3/4/5/134579322/zolurowamasijokeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xexelakufakeze.epizy.com/battle_chasers_nightwar_arena_guide.pdf
    • http://wulemarodexik.rf.gd/creditor_balance_sheet_item.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHong
    • http://www.geocities.com/dnhhng

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df75.bin
2811000d66f5e989d265164890304389a3701859f4424091fee683a74d4acaf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 9272 bytes
font_01_sfnt_off0000f86c.bin
3d9c85eaded154c721f7b285b6087853689163603e89c29fa1b448bef0a8ae75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 5336 bytes
font_02_sfnt_off00010a88.bin
0dcab942b5f91c2eabfea41f3c103f0851896e20deedee7b54958fbb3da0b00e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 4396 bytes
font_03_sfnt_off000117c0.bin
d7d41dc566214c874a5ceac4eca44758b63be7add2fd2b955df4954d16fea0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 11872 bytes

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