Malicious PDF — malware analysis report

Static analysis result for SHA-256 176b7af131b7adbf…

MALICIOUS

PDF

85.7 KB Created: 2021-03-20 03:17:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 215aca761da56b94dc6dedd1c6e144a5 SHA-1: 97421c4b8ec0318ac8fe01b247952cb604e5ca24 SHA-256: 176b7af131b7adbfdedeccc3051afb4657aec4d0f43eb8644e6dc1dc74a2f60a
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for distributing malware or conducting phishing attacks. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack where a password-protected archive is intended to be downloaded. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/strik?utm_term=why+is+my+xbox+one+x+hdmi+not+working
    • https://static.s123-cdn-static.com/uploads/4413004/normal_5fc97808ca841.pdf
    • https://terigemi.weebly.com/uploads/1/3/1/8/131856376/litekalag.pdf
    • http://ceter.xyz/janepalapoi6by0.pdf
    • http://shishkin-seed.xyz/74887775570v3tc9.pdf
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/mifudoras.pdf
    • https://static.s123-cdn-static.com/uploads/4446272/normal_5ff62ea264b27.pdf
    • http://lorozetuwivu.medianewsonline.com/hackerrank_coding_questions_and_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4526930/normal_5ff310c71c2d5.pdf
    • http://zumepaposakuf.scienceontheweb.net/bawuduraritilud.pdf
    • https://xesudubivutomu.weebly.com/uploads/1/3/5/3/135303490/karodimilowutamen.pdf
    • https://cdn-cms.f-static.net/uploads/4491669/normal_602e2912b4501.pdf
    • https://cdn-cms.f-static.net/uploads/4408706/normal_603355ed6f8b7.pdf
    • http://gvidilon.ru/how_to_enable_flash_player_in_chrome_on_android17cua.pdf
    • http://infonewsuk.site/how_to_repair_a_delta_shower_handlev0toh.pdf
    • http://austritkfa.com/91329102050b044.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/12819f01-aa53-491a-b4fc-5a1d2847e5ad/70716117404.pdf
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_14543b8c41534bdc8e24aca606ed43bb.pdf?index=true
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_fd2989d32c9543c3bad38a15fbc238d7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3438599d-79f9-4e35-b448-e25858748ba4/limites_infinito_menos_infinito_ejercicios_resueltos.pdf
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_c946343ea4654855b9d64ff26076bdc6.pdf?index=true
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_1fcbc9e7e98047d58755c3ad1b4da525.pdf?index=true
    • http://luregaw.onlinewebshop.net/dijiwurivixidixuk.pdf
    • http://fidalanono.myartsonline.com/honeywell_rth2310b_manual.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_off00011048.bin
de211693b68ade540703a1d5f313bfe163b8d7bef982a17e20317395a2e5253a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 5476 bytes
font_01_sfnt_off000122e1.bin
8355f6d807fa52b34c1a7e7d3e7425b23700085d4214c984a036a93364d07a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 11444 bytes

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