Malicious PDF — malware analysis report

Static analysis result for SHA-256 8655f6277b270672…

MALICIOUS

PDF

94.2 KB Created: 2021-03-15 07:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 17fb45d7d49d1ff9c71af1c10efd1bce SHA-1: 89e50323bd973bbad369900ff5fd2f3bc7eb646f SHA-256: 8655f6277b270672cb5044789dca4acf1c3b9de0695d124ad4024e145e2f7e8a
146 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, appears to be a lure related to 'cute emoji keyboard apkpure', directing users to suspicious URLs. The presence of multiple disposable domains and link farms suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.
  • 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://nipisod.ru/wix?keyword=cute+emoji+keyboard+apkpure PDF link annotation
    • http://kiruvoxexuk.iblogger.org/ielts_writing_test_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/najiligopej/iggbihe/nelikinokofagubefuwedanik.pdfIn PDF document text
    • http://cadenalia.com/sound_meter_apk_mirrorhxg5u.pdfIn PDF document text
    • http://bosamitax.22web.org/5499365472.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/ijgjpib/reporter_gazeta_amharic_news.pdfIn PDF document text
    • http://hook-up.fun/wofazela157kp.pdfIn PDF document text
    • https://legorigerelok.weebly.com/uploads/1/3/6/0/136056749/9823933.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/jzjbicd/25446987507.pdfIn PDF document text
    • http://magnitoli-2ekran.site/south_carolina_driving_permit_test_practice7fd1c.pdfIn PDF document text
    • https://jexedijelewa.weebly.com/uploads/1/3/4/5/134518212/3573956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepukedosapiw.rf.gd/how_often_do_i_need_to_work_out_to_see_results.pdfIn PDF document text
    • http://zojabavikejowi.rf.gd/starting_out_with_visual_c_5th_edition_answers.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_333a0d10cad040f4b5b6aac611ae268a.pdf?index=trueIn PDF document text
    • http://nifekubipaxo.epizy.com/jerapawoje.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_f2f8435ecab64c448a7945d15df17616.pdf?index=trueIn PDF document text
    • http://tufelorit.rf.gd/86161477805.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 3564 bytes
SHA-256: ca89b15f3ba3ffadee6ab9a77badcc0a836fd6c267ac3676485122a8d4a26bab
font_01_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 5184 bytes
SHA-256: cff7de038c9d71e0582b209d6e31b45ac83b29fcb4914d935ef30330b0d53388
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 2744 bytes
SHA-256: dae0f12506c17deaa818396cb86411da2f7a72f10e575d6fda98e021880a3e82
font_03_sfnt_off00012b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9F 11808 bytes
SHA-256: ffdc27f30dcaf64119c703e5606ef02e6dd739893e13a9f8d30f9c7bea204ba2
font_04_sfnt_off000153fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FC 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e