Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcb72721d66f135…

MALICIOUS

PDF

84.3 KB Created: 2021-04-09 04:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 112085f70a3564f7209ad60b2d3bf244 SHA-1: eba30e48eb02addd5874ab547fc38db64077a8a2 SHA-256: 1dcb72721d66f13567199efc1c1c614b0f36efb9349bd1ada65732bbff95931d
224 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure, a password-protected-archive lure and an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/strik?utm_term=what+to+say+on+resume+for+customer+service PDF link annotation
    • http://ruwemipuwev.mypressonline.com/vivuvorudiwugojix.pdfIn PDF document text
    • http://morasufas.iblogger.org/4664484557.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/1063476.pdfIn PDF document text
    • https://xakediripikevul.weebly.com/uploads/1/3/4/3/134338645/177df.pdfIn PDF document text
    • http://hookup666.site/99417670767e7fma.pdfIn PDF document text
    • http://kinatoguvekajux.22web.org/mathematical_statistics_freund.pdfIn PDF document text
    • https://didaladajede.weebly.com/uploads/1/3/4/5/134524443/2137651.pdfIn PDF document text
    • http://vunusidaf.22web.org/algebraic_expressions_grade_7_test.pdfIn PDF document text
    • http://avit0.cc/6388577756gkzw0.pdfIn PDF document text
    • http://gufutaca1.xyz/87729817564nsucl.pdfIn PDF document text
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/b4bed2edcc8.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/zumirubujobuvikipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vunizi/9223906335.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/5446265668.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_0e876469cffd460882126ef95228325e.pdf?index=trueIn PDF document text
    • http://lafugigolemetuk.rf.gd/zoxejetudefavonufagag.pdfIn PDF document text
    • http://jujuletofu.onlinewebshop.net/70980901363.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/continental_girbau_washer_for_sale.pdfIn PDF document text
    • http://zukugomofam.epizy.com/white_tiger_masked_singer_performance_episode_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/50265029372.pdfIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_bdc637d5c52b41acbb7aacf5f08c9515.pdf?index=trueIn PDF document text
    • http://temodorofeg.atwebpages.com/describing_people_s_appearance_english_exercises.pdfIn PDF document text
    • https://7043ee2c-bc2d-4d46-b82c-b0075177c1aa.filesusr.com/ugd/f862b5_bd0f02330c5246818c9c79b2c96da417.pdf?index=trueIn PDF document text
    • https://aaca6425-83b8-4992-a49d-2ec8a2d61848.filesusr.com/ugd/304e3c_49400a5c7a194fdabcaa35e4a0df59b9.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_d878a182b0a44b28b45ca6960295bc73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninazarila/ave_maria_malayalam_song.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 5148 bytes
SHA-256: 51e133698b1e37d9772dc01ada076528cc71f146f9ede4a6ea9471208f97a2df
font_01_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 11344 bytes
SHA-256: 0776d65e80330e20572d4e5610dc4ba710d2f3e928db53b09e8023dcf7ceae10
font_02_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333