Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83096df7b5ee144…

MALICIOUS

PDF

82.6 KB Created: 2021-03-06 17:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ea567dd50abd2e9a5e5e618f0e62bf86 SHA-1: db55f76c2bf36cc19b5c008b74df7ffef7143cb8 SHA-256: b83096df7b5ee144ff93fb486e8590c2198da5a6574b97b1f09b734d416bb9ee
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=english+chinese+dictionary+app+ios PDF link annotation
    • https://cdn.sqhk.co/nizufalagef/Hjfjhjj/hp_smart_tank_plus_551_setup.pdfIn PDF document text
    • https://rulozakowix.weebly.com/uploads/1/3/4/7/134730123/wekomegabugu-dedewejirezimu.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwokujuwe/hifggig/74531602929.pdfIn PDF document text
    • http://itdiscounts.info/are_anker_products_any_good1375f.pdfIn PDF document text
    • https://kozikimonewuzo.weebly.com/uploads/1/3/4/5/134592445/1d7b6276092e05.pdfIn PDF document text
    • https://kivinogafuwej.weebly.com/uploads/1/3/4/7/134702495/xilapujage-malupuvudiwebos.pdfIn PDF document text
    • http://igcopyrightverify.com/84605419421pw5li.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/gJ7ghek/83736580462.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/moore_critical_thinking_12th_edition_access_codeyiu7a.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/8413576.pdfIn PDF document text
    • http://astropsychology.website/what_does_a_confidence_fitness_machine_do4lxgb.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/9350340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jupetovujek.epizy.com/rogakirolop.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/67870119780.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/butasivofusa.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/59774488814.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/information_technology_salary_philippines_per_month.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/lurisama.pdfIn PDF document text
    • http://bojefej.epizy.com/adobe_photoshop_cs6_online_free.pdfIn PDF document text
    • http://jefesati.rf.gd/align_start_android.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 3048 bytes
SHA-256: d40973cec98b83290f22cad00a0b1e209b57de1c3f89c5207d1542a9fd6d80f7
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 5396 bytes
SHA-256: 4840543f413d8e0188435f56d568176569316255f93566baacee40fcb92dabe6
font_02_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 1936 bytes
SHA-256: cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
font_03_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 11480 bytes
SHA-256: fddf2f37a5126586d0da17daaad978643cd6dc4f2f73cc7a03de2165afc66d13

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